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Sundials







Books

https://b-ok.cc/book/937642/6783b9
Easy-to-Make Wooden Sundials
Milton Stoneman

Excellent manual for the beginner explains how to make five different sundials. Includes templates pre-calculated for latitude. Few tools are needed to make dial more accurate locally than standard time.

https://b-ok.cc/book/2873725/0f587e

Roman Portable Sundials: The Empire in your Hand
Richard J.A. Talbert

In an unscientific era when maps were rarities, how did ancient Romans envisage their far flung empire? This was done by various means for certain, including with the aid of an ingenious type of portable sundial that has barely attracted notice. As the Romans understood before the first century BCE, to track the passage of the sun across the sky hour-by-hour one needed to know one's latitude and the time of year, and that, furthermore, sundials did not have to be fixed objects. These portable instruments, crafted in bronze, were adjustable for the changes of latitude to be expected on long journeys--say, for instance, from Britain to Spain, or from Alexandria to Rome, or even on a Mediterranean tour. For convenient reference, these sundials incorporated lists of twenty to thirty names of cities or regions, each with its specific latitude. One of the insights of Roman Portable Sundials is that the choice of locations offers unique clues to the mental world-map and self-identity of individuals able to visualize Rome's vast empire latitudinally.

The sixteen such sundials known to date share common features but designers also vied to create enhancements. Comparison with modern calculations shows that often the latitudes listed are incorrect, in which case the sundial may not perform at its best. But then the nature of Romans' time-consciousness (or lack of it) must be taken into consideration. Richard Talbert suspects that owners might prize these sundials not so much for practical use but rather as prestige objects attesting to scientific awareness as well as imperial mastery of time and space. In retrospect, they may be seen as Roman precursors to comparable Islamic and European instruments from the Middle Ages onwards, and even to today's luxury watches which display eye-catching proof of their purchasers' wealth, sophistication, and cosmopolitanism. Richly enhanced with detailed photographs, line drawings, maps, a gazetteer, and a table of latitudes and locations, Roman Portable Sundials brings these overlooked gadgets out of the shadows at last to reveal their hitherto untapped layers of meaning.

https://b-ok.cc/book/981686/e529f3
Sundials: Design, Construction, and Use (Springer Praxis Books Popular Astronomy)
Denis Savoie

https://b-ok.cc/book/1047444/8e77cb
Sundials, how to know, use, and make them,
R. Newton Mayall, Margaret L. Mayall

https://b-ok.cc/book/3586940/b880b3
Sundials: Their Theory and Construction
Albert Waugh

https://b-ok.cc/book/864940/ca063f
Sunclocks: Paper Sundials to Make and Use
Jeffrey V. Trionfante



Patents

https://worldwide.espacenet.com/advancedSearch?locale=en_EP
European Patent Office Advanced Search

Sundial business card

CN207725081
CN207725081
The utility model discloses a sundial business card, including the base member, the scale is established the surface edge of base member, the time digit corresponds the scale is established at this scale inboardly, and the pointer preformed hole is established the surface of the base member of time digit inboard, the pointer is inlayed in the pointer preformed hole, the pointer fixed orifices is established the below of pointer preformed hole, it is fixed when the pointer fixed orifices is used for measuring the pointer, by adopting the above technical scheme, compare with current technique, the utility model discloses a wooden material, not only lightly but also durable, the business card still has the function of sundial concurrently simultaneously, can the time of calculating on daytime, the usage is diversified.

Sun coordinate measurement equipment
CN108240805
CN108240805
The invention provides sun coordinate measurement equipment, relates to a measurement instrument and particularly relates to the sun coordinate measurement equipment for measuring sun coordinates including elevation angles and azimuth angles. According to the sun coordinate measurement equipment, the elevation angles and azimuth angles of sun can be rapidly, accurately and directly measured. The sun coordinate measurement equipment is provided with a base, a rotating body, a protractor and a sundial surface, wherein the rotating body is rotationally connected with the base, the protractor and the sundial surface are arranged in the rotating body, the protractor is vertically intersected with the sundial surface and is in matched connection with the inner wall of the rotating body, the radius of the protractor and the radius of the sundial surface are same as the radius of the rotating body, and the vertical intersection line between the protractor and the sundial surface is coincided with middle axis of the rotating body and the rotary shaft axis of the rotating body; a circumference scale marker is arranged on the base, and the round center of the circumference scale marker is located on the rotary shaft axis of the rotating body; and the rotating body is a hemispherical bowl-shaped rotating body, the protractor is a semi-wafer-shaped protractor, and the sundial surface is a semi-wafer-shaped equator type sundial surface.

Sundial ancient chinese sundial subassembly and demonstration teaching aid
CN207366958
CN207366958
The utility model belongs to the technical field of teaching equipment technique and specifically relates to a sundial ancient chinese sundial subassembly and demonstration teaching aid is related to,wherein sundial ancient chinese sundial subassembly includes sundial dial plate, gnomon and transparent sky dome, it dome is the hemisphere, corresponds the cover and locates on the sundial dial plate, the gnomon is vertical to be set up in the center of sundial dial plate, be provided with division of day and night table and ancient chinese sundial projection area on the sundial dial plate. This sundial ancient chinese sundial subassembly combines sundial and ancient chinese sundial be in the same place, can demonstrate sun track in a day, can demonstrate the recurrence movement track of subsolar point in a year again, and not only mr's teaching is more convenient, and the student can also the independent operation, probe into the change of shadows cast by the sun in day neutralization ayear, understands the basic principle that shadows cast by the sun motion, subsolar point recurrence were moved.

Self-orienting platform
US7954247
US7954247
A self-orienting platform device is provided having a platform that is rotatably adjustably attached to a body. The device is provided with adjustable weights to ensure even rotation. The attachment between the platform and the body is such that when the body rotates, the platform rotates with it, but the attachment can be adjusted such that the user can rotate the platform relative to the body when desired. The device comprises a magnet with an attached magnetic north indicator, and can be set by rotating the platform relative to the body so that when the magnet points to magnetic north, the magnetic north indicator points to a selected marking or other feature on the platform. The platform can be rotated with respect to the body to account for the difference between magnetic and true north, so that the selected marker is aligned with true north. The device can be used as a self-orienting sundial to tell the time of day by the sun, and because it is portable and does not have to be reset for different locations (within the same general latitude and longitude and time period), the sundial can be moved from place to place and used as a teaching aid in classrooms, and an interactive decorative object in homes and gardens.

SUNDIAL USING PRISM
KR20180043534
KR20180043534
The present invention comprises: a non-permeable main body (110); a plurality of slots (120) formed through the non-permeable main body (110) on the top of the non-permeable main body (110); and a prism (130) installed on the inner circumferential surface of the non-permeable main body (110) by corresponding to a location where the slot (120) is penetrated. Sun light is refracted by the prism such that rainbow colored sun light (14) spread in the non-permeable main body (110) displays a time. Thus, features of the sun light can be learned while displaying a time.

Fabricated model sundial and the assembly method
KR20180025605
KR20180025605
The present invention relates to a fabricated model sundial and an assembly method thereof and, more specifically, provides a fabricated model sundial and an assembly method thereof, wherein in the fabricated model sundial, each component printed with a planar figure is cut along perforated lines, and then, the component is bent and bonded to be directly assembled. Therefore, a principle of the sundial, a solar term, time, and a zero needle installation principle are accurately understood to improve learning efficiency. Moreover, through crafts, achievement and interest are provided, and further, during an assembly process or after completion, the whole sundial is not bent or twisted to be strongly manufactured.

A sundial formula sun location and tracking detection device
CN206962759
CN206962759
The utility model discloses a sundial formula sun location and tracking detection device for spotlight solar energy component, include with solar cell panel by synchro -driven pivoted base plate with set up the determine module who is used for detecting sun spatial position in the base plate upper surface, determine module blanking disk, bracing piece and photo resistance, the blanking disk passes through that the bracing piece is unsettled and parallel to be supported in the base plate, the photo resistance is a plurality of and fixed the setting in the base plate upper surface, and the shadow position that the blanking disk is followed the girth direction distribution of the front projection shadow of perpendicular to base plate orientation and is used for detecting the light screen is wound in a plurality of photo resistance, possess the high accuracy and not influenced by environmental factor and constantly trail solar position, can weaken environmental factor and to the interference of signal, reduce the sensing signal error.

Small -size equator type sundial
CN206805166
CN206805166
The utility model discloses a small -size equator type sundial, including sundial panel, sundial needle, the sundial needle is planted perpendicularly in sundial panel center, the sundial includes a base, compared with the prior art, the sundial panel is through two hinges and two pad connection, sundial panel center edge to the sundial panel under is equipped with marginal opening under the perpendicular to sundial panel, insert and put the protractor that has a semi -circular hole of perpendicular to base in the opening, it presses from both sides to be equipped with the dismantled angle fixed who is used for fixed sundial board angle on the protractor, the thickness of gasket equals the perpendicular distance of protractor " 0 " scale mark to the base on the base. The utility model discloses a small -size equator type sundial's sundial plane angle degree can be adjusted as required at will, and the ten fens accuracies of time data that record.

Solar collector automatic tracking testing arrangement
CN206114273
CN206114273
The utility model relates to a solar collector automatic tracking testing arrangement, including installing support and stand, among this solar collector automatic tracking testing arrangement, provide the power supply for whole device through the water pump, provide the supply of circulating water, frequency conversion control plays the effect of steady pressure flow to the flow that makes the device test period stable the setting value 1% within, improved the reliability of device, and, add nice and warm cooling through refrigeration mechanism and the heating control mechanism temperature in to the pipeline, carry out accurate monitoring to temperature everywhere through temperature sensor simultaneously, the fluctuation of messenger's temperature has further improved the reliability of installing no longer than 0.1 DEG C, moreover, carry out accurate monitoring to solar position through sundial and irradiatometer, carry out accurate monitoring to wind speed and wind direction through three cup type wind speed measuring apparatus, can rotate in horizontal direction and vertical direction through heat collector tracking mechanism again, guarantee that the heat collector can rotate by the automatic tracking sun.

Sundial
CN205194143
CN205194143
The utility model relates to a sundial, include: balanced structure, the sundial face, connect in balanced structure one end, and with balanced structure is certain inclination, sundial needle, one end install in the sundial face, the other end is to keeping away from the direction of sundial face is extended. Above -mentioned sundial, balanced structure can play the sundial face and support and the balanced action, through placing balanced structure at the horizontal plane, can fix the position of sundial face to the projection of sundial needle on the sundial face through installing on the sundial face was instructed the time. This sundial's overall structure is succinct, light to can conveniently remove and use.

Simulation sun shines sundial explanation device of shadow
CN205140298
CN205140298
The utility model discloses a simulation sun shines sundial explanation device of shadow, including base, linking bridge, LED lamp, sundial pointer, inverted image scale plate, linking bridge includes the main support and the vertical rod of evenly distributed on the main support that links to each other with the base, this each the lower extreme of vertical rod all is connected with the LED lamp, and the inverted image scale plate is located the main support bottom, just the vertical projection mid point department of installing at the inverted image scale plate of sundial pointer to use the sundial pointer on average to cut apart 12 as the centre of a circle on the inverted image scale plate and wait 13 index wires that the branch is regional and the formation reflection is described, be equipped with induction system on the LED lamp, the visit personnel can control the LED lamp switch on the main support through induction system, simple and clear's the theory of operation of understanding the sundial.

SUNDIAL COMPASS
US2016076887
US2016076887
A system and method for determining one of true north and true south is described. One embodiment includes a sundial compass having a mounting base with a true north line, a dial plate, and a gnomon mount indicator. The true north line and dial plate are configured to indicate one of true north and true south based on a time clock calibration. A method of determining direction is also disclosed. The method includes determining calibration information, inserting a gnomon into a gnomon mount indicator, adjusting the gnomon based on the known calibration information and a time clock calibration, placing the sundial compass such that the true north line indicates one of true north and true south, and determining one of true north and true south.

MANUFACTUAL APPARATUS FOR SUNDIAL
KR101565063
kr101565063
The present invention relates to a sundial manufacturing device to easily manufacture a sundial on a plane or a free curved surface, a sundial manufacturing method using the same, a sundial inspecting method, and a timeline manufacturing method. The sundial manufacturing device to manufacture a sundial comprises: a zero needle facing true north; a season line to provide season information; and a time line to provide time information on the target surface. The sundial manufacturing device includes: a columnar body which is mounted on the end of the zero needle to look in the same direction as the zero needle and is formed in a columnar body shape; and a light source to be formed to irradiate laser light toward the columnar body. The laser light is reflected or refracted from the columnar body and a straight line or a curved line is displayed. The season line is produced along the straight line or the curved line displayed on the target surface. Multiple time points which are displayed on the brightest points on the straight line or the curved line and correspond to a specific time are connected, and then the time points are produced. Accordingly, the sundial can be easily manufactured on a free curved surface.

SUNDIAL CAPABLE OF MEASURING STANDARD TIME
KR101512268
KR101512268
The present invention relates to a sundial capable of measuring a standard time. The sundial includes: an analemma date scale having an '8' shape displaying a change in equation of time in culmination time of a region of which a standard time provided to be measured, and having a month point displaying a point pertaining to a point on the first day of every month; the month point displaying the point pertaining to the first day of every month on the analemma date scale; a middle point displaying the point pertaining to the fifteenth day or the sixteenth day of every month in the center between the month points on the analemma date scale; a seasonal division point displaying the point pertaining to the 24 seasonal divisions on the analemma date scale; a date scale board having a meridian line connecting the south side and the north side; a standard time visual plate positioned in an oval shape about the center of date scale board, and displaying a visual point on every half hour without correcting a difference in longitude and displaying the visual point to enable a noontime visual point in the north side of the meridian line.

Improvements in portable sun dials
GB700983
A portable sundial comprises' a graduated dial adjustable means for positioning or supporting the dial at any required angle to the horizontal and a shadow-casting style or gnomon in the form of a pin or rod engageable in a hole in the dial so as to be removable therefrom. In one example the sundial comprises a holder 1, Fig. 3, having a time scale 4 and a hole 7 for the pin 8 forming the gnomon and the support. The pin 8 is marked with latitude graduations so that the holder 1 may be adjusted for the correct inclination for the place of use. When not in use the pin 8 is retained in a tubular recess 12. In another example, Fig. 4 (not shown), the holder 1 is hinged at its top edge to a plate which is hinged to a base plate along which the lower edge of the holder is adjustable. In another example, Fig. 6, the scale 4 is on a member which is rotatable with respect to the holder 1 so as to be adjustable for longitude with respect to a reference mark 5. The holder 1 has clamping screws 19 which engage slotted quadrants 17 on a base 18. If desired the base 18 may be dispensed with and the inclination of the holder determined by the pin 8 as before. In another example for use in Britain the scale 4, Fig. 1, is on a member rotatably carried by a collar 3 which is rotatable with respect to the holder 1. The reference mark. 5 is again on the holder 1 and the collar 3 has a scale including a reference mark 6 so that the scale 4 may be adjusted to allow for the difference between solar time and G.M.T. at the place of use. The pin 8 is retained by a screw 10 and a latitude scale 11 is marked on the edge 13 of the holder 1. Insertion of the pin 8 in the hole 12 locks the parts 1, 3 and 4. A movable cursor may be provided. Where the scale 4 is rotatable with respect to the holder 1 the instrument may be used in association with a watch as a direction finder or to determine longitude. Two scales 4 may be provided, one for summer time and the other for winter time.

Improvements in solar clocks
GB328579
gb328579
In a portable sundial for the mean time at the locality of erection or for other meridians (e.g. the standard meridian of the country), the dials carrying the hour curves and day circles are arranged parallel to the equitorial plane and can be turned through 360 about a gnomon, which passes through the centres of the dials and is arranged parallel to the earth's axis. There are four dials used, two at a time, one pair for June to December and the other pair for December to June. Fig. 1 shows a pair of dials in section, the device being set for the 42nd degree of latitude. The two dials are on concave plates, one facing upwardly and one downwardly, about a central gnomon 8. A triangular base plate 1 secured in a horizontal position to a wall has a threaded shaft 2 ending in a nut 3. This base plate 1 is so mounted on its support that one of its points is directed substantially towards the North Pole, for the northern hemisphere. A frame mounted on a plate 4 is clamped in position by tightening nut 3 on to plate 4 as soon as the latter has been adjusted horizontally. In the frame is a shaft 5, to the end 5<1> of which is pivoted an arm 6 carrying the pair of dials 7. Integral with arm 6 is a graduated quadrant 16 which, when the correct mark (42 in this case) coincides with the axis of shaft 5, is clamped by a screw 17. The device is set to the meridian of the locality as follows :-the plate 4 carries a slate 11 with rod 12, eye 13 and plumb-bob 14. The point indicated on this slate by bob 14 is marked and from this point as centre two or three circles are drawn. The points at which a ray of light through eye 13 cuts these circles, are marked and the resulting chords are bisected. These points of bisection are joined to the common centre of the circles, this straight line indicating the meridian. The next day when the ray through eye 13 intersects this meridian line the dial plates are so adjusted that the shadow of gnomon 8 falls on the 12-24 line. Nut 15 is then tightened to hold the shaft 5 in its adjusted position. A scale on the frame and a pointer 19 rigid with shaft 5 indicate, after the device. has been adjusted, whether any further adjustment has been made. In order to read the time of some meridian other than that of the locality of the device, it is only necessary to move the dial about the gnomon by an amount corresponding to the difference of the meridians. For this the edges of the, dials may be graduated.

Portable hanging sun-dial - is in form of flat plate or cylinder with demountable stylus carried on sprung clip
FR2459504
FR2459504FR2459504
The sundial is in the form of a flat plate or a cylinder both having a suspension ring (12) at their top surface. In the flat plate case one side carries the time scale lines (2) drawn across parallel lines (7) corresponding to dates through the year and terminated at their upper end by holes (6) through the plate. The stylus (11) is held when not in use in a compartment (8) at the plate base and consists of a rod which fits into the plate date holes. In the cylindrical case the stylus is carried on a sprung clip fitting over the cylinder. The reverse side of the plate carries the date line identification (3) and a correction table (4) for local official time

Portable adjustable direct reading sundial
FR2765977
fr2765977
The sundial has a base plate (H) and side pieces (Vw,Ve). The baseplate (H) has a fixed foot (Pn) and two adjustable feet (Pe,Pn) which allow a single design to be used throughout a large area. A pyramidal stylus (S) is screwed to the base plate (H). The sundial is read from lines drawn on inserts (Th,Te,Tw) attached to the base plate and side pieces (H,Ve,Vw) and these inserts are reversed at the winter and summer solstices which allows a simpler layout and easier reading. The lines on the inserts are drawn from computer calculations for every fifteen days which take all the significant astronomical factors into account.

Crossed sighting tube transparent cylindrical time and solar term sundial
CN203587983 // CN103513566
CN203587983
The utility model relates to an equatorial sundial for measuring time and solar terms by a shadow of an object in the sunlight. A crossed sighting tube transparent cylindrical time and solar term sundial disclosed by the utility model comprises a base, a regulating and fixing device, a transparent cylinder, a sighting tube and a collar; the transparent cylinder is a hollow part; a group of time generating lines and a group of solar term circles are marked on the lateral surface of the transparent cylinder; the time generating lines are transparent cylindrical generating lines; the solar term circles are in parallel to both bottoms of the transparent cylinder; the sighting tube is of a cylinder shape, has a small radius and is non-transparent; the sighting tube passes through the centers of both the bottoms of the transparent cylinder; a sighting hole is formed in the sighting tube and is over against the North Star; the non-transparent collar of which the radius is slightly larger than that of the sighting tube is arranged outside the sighting tube at the midpoint of the axis of the transparent cylinder; the sighting tube and the collar form a structure of a crossed appearance. Time is read out by scales of the time generating line where a shadow of the sighting tube is positioned; the solar term can be read out at any time by scales of the solar term circle where a shadow of the collar is positioned; the crossed sighting tube transparent cylindrical time and solar term sundial is not limited to the high noon.

Crossed sighting tube transparent spherical time and solar term sundial
CN203587982 // CN103513565
CN203587982
The utility model relates to an equatorial sundial for measuring time and solar terms by a shadow of an object in the sunlight. A crossed sighting tube transparent spherical time and solar term sundial disclosed by the utility model comprises a base, a regulating and fixing device, a transparent sphere, a sighting tube and a collar; the transparent sphere is a hollow part; a group of time longitude circles and a group of solar term latitude circles are marked on the spherical surface of the transparent sphere; the time longitude circles are intersected at both the north and south poles; the sighting tube takes the shape of a hollow non-transparent cylinder, has a small radius and passes through two poles of the time longitude circles; a sighting hole is formed in the sighting tube and is over against the North Star; the collar is untransparent and sleeves the sighting tube; the circle center of the collar is positioned in the spherical center of the transparent sphere; the radius of the collar is slightly larger than that of the sighting tube; the sighting tube and the collar form a structure of a crossed appearance. A shadow of the sighting tube is projected to the spherical surface of the transparent sphere by the sunlight, time is read out by scales of the time longitude circle where the shadow is positioned, the solar term can be read out at any time by scales of the solar term latitude circle where a shadow of the collar is positioned, and the crossed sighting tube transparent spherical time and solar term sundial is not limited to the high noon. The crossed sighting tube transparent spherical time and solar term sundial is suitable for the equatorial area and the area above the equator.

Season longitude and latitude sundial
CN203520036
CN203520036
A season longitude and latitude sundial for astronomy and calendar popularization of science culture landscape is provided. The season longitude and latitude sundial is formed by a circular-ring-shaped equator sundial (3), a cylinder or polygon prism season sundial (10) and a trapezoid pedestal (18) which is higher in the north and lower in the south, a Yin Yang Fish Taiji Diagram (5) and a circle center cross (11) are accommodated in an inner ring of the equator sundial (3), an included angle of a straight-rod-shaped sundial needle (9) installed on the Northern Hemisphere and the ground plane is equal to a local latitude value, local time can be accurately displayed by sunlight on longitudes (13) of the season sundial (10) through the circle center cross (11), and the zodiac, Twenty-four Solar Terms and Gregorian calendar dates thereof which are contrasted with English, Chinese, ancient and modern titles are displayed on latitudes (14). The season longitude and latitude sundial can be used in wide places that have about ten hours sunlight in clear days.

Common method and system for three-dimensional simulation of sundial
CN103425850

The invention relates to a common method for three-dimensional simulation of a sundial. The method comprises the following steps that S10, the three-dimensional models of the surface and the pointer of the sundial are built; S11, the three-dimensional model of the sundial is built; S12, the solar altitude and the solar azimuth of a site at different moments are calculated; S13, the positions of the shadows of the pointer formed on the face at all the moments from sunrise to sunset are calculated, and the positions of all moment lines are obtained; S14, the motion track of a sundial shadow in any time frame from the sunrise to the sunset is dynamically simulated, and the simulation data from the sunrise to the sunset in one day or a year are output. The designed sundial is visually shown in a three-dimensional mode, the positions of the moment lines are visually simulated and analyzed, a visual and convenient simulation analysis and auxiliary demonstration tool is provided for sundial individualized design, city landscaping planning, science teaching and research and science popularization education, and the effect of sundial design and building is improved.

Improvements in or relating to sundials
GB264274
gb264274
A portable sundial is so constructed that at any geographical position it may, by a simple adjustment, be adapted to give the apparent or mean solar time of that, or any other, position. A first gnomon A coacts with the hour lines marked on the dial and a second gnomon B coacts with a map also marked on the dial and covering the area within which the dial may be used correctly. In the construction' described, when the dial is horizontal and correctly orientated it is adjusted for Tremoli, 42 N. and 15 E. In this position the plumb line from the hole g in the gnomon A meets the dial at p, on the 42 line for latitude and on the 15 line for longitude marked thereon, and the plumb line from the gnomon B falls on Tremoli on the map. Passing through the point e and at right-angles to the meridian line c-e is the equinoctial line. c is the dial's centre and g, c lies along the polar axis. If the dial be taken to a place of different latitude on the same meridian, say 50 E., the dial is orientated as above and then rotated about the equinoctial line 8 , the difference between the latitudes of Tremoli and the new place; the plumb-lines falling then on the correct latitude and longitude lines and map position. For a locality of different latitude and different longitude to Tremoli, say 50 N. and 30 E., the dial is first orientated and rotated 8 about the equinoctial line as above, and then rotated about the line g-c until the plumb line from g falls on the line corresponding to the new meridian, 30 E. The dial may also be so adjusted as to give the time for a longitude other than that of the place at which the dial is actually situated.

Sundial
US4785542
US4785542
A sundial which is characterized by a selectively portable or permanent base and support bracket combination, which support bracket facilitates an angular movement for effecting latitude adjustment to the sun's path and includes a support bracket plate, a middle plate pivotally connected to the support bracket plate and a connecting plate pivotally attached to the middle plate, with a pair of semi-cylindrical dials secured to the connecting plate in oppositely-disposed relationship. Analemma adjustment for coordinating sundial time with "clock" time is facilitated by an adjustment lever which is pivotally attached to the connecting plate and the middle plate and is adjusted with respect to an analemma path inscribed on the connecting plate. Daylight savings time adjustment is also facilitated by pivoting the middle plate with respect to the support bracket plate and this adjustment also allows correction for location of the sundial within the time zone. A pair of gnomons are suspended outwardly of the concave dial curvatures, respectively, for casting a shadow on the dials and indicating the time of day and day of the year responsive to rotation of the earth and transversal of the shadow across the dials. Each gnomon is spherical in shape and is suspended in the center of a diameter of each of the dials and the connecting plate and dials are oriented at a selected angle with respect to the base, which angle is determined by the latitude at which the sundial is positioned. Each of the dials is further provided with hour and month markings to facilitate direct reading of the time of day and the approximate day of the month responsive to the sequential casting of the shadow by the gnomons.

SUNDIAL
US7950159 / US8528218
us7950159
A hemispheric armillary with arms and supporting a structure for supporting a gnomon over a time indicating dial plate is constructed to avoid the arms' shadows from eclipsing the gnomon shadow on the dial plate.

SUNDIAL FOR TELLING SOLAR TIME AND CLOCK TIME ACROSS A RANGE OF LATITUDES AND LONGITUDES
US8333016
US8333016
A sundial for telling apparent solar time and clock time across a range of latitudes and longitudes. A solar dial is formed with an index point and a noon hour point. A plurality of concentric latitude indicia are centered at the index point and at least one map indicium is overlaid by the concentric latitude indicia where the map indicium has geographic latitudes corresponding with the concentric latitude indicia on the solar dial. The solar dial also includes a plurality of solar time indicia radiating generally outward from the index point drawn with respect to the noon hour point according to the hour line equation at each concentric latitude indicia intercept.; An elongated gnomon projects from the index point, whereby the sun's shadow cast by the gnomon intersects the solar time indicia in relation to the concentric latitude indicia to provide a reading of apparent solar time for the user's location on the map indicium.

Automatic-adjustment sun-tracking device
CN202486627
CN202486627
The utility model provides a technical scheme for an automatic-adjustment sun-tracking device. According to the scheme, the device comprises a solar cell panel with a bracket, wherein a sundial pin is arranged at the center of the solar cell panel and vertical to a plane on which the solar cell panel is located, a plurality of photosensitive devices are arranged on the solar cell panel and arranged on circumference with the sundial pin being a circle center, driving motors which drive the solar cell panel to overturn are arranged below the solar cell panel, and the photosensitive devices control the driving motors. The device with the scheme has the advantages of high tracking accuracy and sensitivity and can adjust the direction of the solar cell panel promptly so as to enable the cell panel to obtain maximum light radiation, and the cost of the device is reduced.

Multipurpose equatorial sundial
CN202281915
CN202281915
The present utility model discloses a multipurpose equatorial sundial. The equatorial sundial is composed of a sundial disk, a sundial needle and a sundial pedestal, the sundial disk is arranged on the sundial pedestal, and the sundial needle is vertical with the sundial disk and arranged on the center of the sundial disk. The sundial is characterized in that the sundial disk is composed of an outer ring and an inner disk, the outer ring and the inner disk can be rotated in a relative way, the sundial disk is parallel with the equatorial plane of the earth, earth longitudes are engraved on the surface of the outer ring, and characters, patterns and scales are engraved on the surface of the inner disk. By adopting the sundial, mean solar time can be conveniently observed, the sundial can also be used to observe true solar time and mean solar time, and solar times, months and zodiacal constellation palace; the sundial is in common use all around the world; and the sundial can be converted conveniently in situations of true solar time and mean solar time.

Sun tracking and positioning device and method based on sundial
CN102183967

The invention discloses a sun tracking and positioning device and method based on a sundial. The sun tracking and positioning device mainly comprises a digital signal processing device, a data acquiring device, a sundial and the like which are sequentially connected, wherein the sundial generates a corresponding shadow on a shadow surface of the sundial according to the change of a sun illumination position; the data acquiring device is used for converting shadow information on the shadow surface into digital electric signals; the digital signal processing device is used for processing the input signals and reducing the shadow information on the shadow surface of the sundial; and a sun level azimuth angle and a sun height azimuth angle are calculated to obtain the sun position. The sun tracking and positioning device is used for acquiring sun azimuth information in real time and obtaining the sun accurate azimuth, has the advantages of stability and reliability as well as strong antijamming capability, and is suitable for most of solar energy utilizing devices.

Simple sun horizontal coordinate measuring instrument
CN201555578

A simple sun horizontal coordinate measuring instrument relates to a measuring instrument, and particularly relates to a simple sun horizontal coordinate measuring instrument used for measuring sun horizontal coordinates, namely, an elevation angle and an azimuth angle. The utility model provides a simple sun horizontal coordinate measuring instrument used for measuring a sun elevation angle and a sun azimuth angle quickly, accurately and directly. The simple sun horizontal coordinate measuring instrument is provided with a base, a rotator, an angle gauge and a sundial surface, wherein the rotator is in rotational connection with the base; the angle gauge and the sundial surface are arranged in the rotator; the angle gauge and the sundial surface are vertically intersected and connected with the inner wall of the rotator in a matched manner; the semidiameters of the angle gauge and the sundial surface are equal to that of the rotator; a vertically-intersected intersecting line, a medial axis of the rotator and a rotating axle center line of the rotator are overlapped; a circumferential scale mark is arranged on the base; the center of the circumferential scale mark is positioned on the rotating axle center line of the rotator; the rotator adopts a hemispherical bowl-shaped rotator; the angle gauge is a semicircular sheet-like angle gauge; and the sundial surface is a semicircular sheet-like equatorial sundial surface.

Multifunctional gnomon
CN201464827

The utility model relates to a multifunctional gnomon comprising a square jade tablet as a platform, wherein one end of the square jade tablet is provided with a watch, a protractor of 180 degrees is arranged on the surface of the square jade tablet under the watch, a length and size table is arranged on the extension line direction of the surface of the square jade tablet in the 90 degree direction of the protractor, the other end of the square jade tablet is provided with a sun height measurer, the watch of the sun height measurer is connected with a fixing seat fixed on the square jade tablet by a swinging shaft which can swing from left to right, and both sides of the square jade tablet are respectively provided with a thermometer, a water level gauge and a compass. The multifunctional gnomon integrates the functions of a sundial, a gnomon, the water level gauge, the sun height measurer, the thermometer, the compass, and the like into a whole and is multifunctional, and therefore, a teacher can conveniently operate a plurality of teaching appliances to complete various measurements in short time. The multifunctional gnomon can increase the learning interests of students and teaching effects, and is an appliance which is suitable for natural science teaching.

Clock for marking solar terms
CN101592915

The invention relates to a clock structure, in particular to a mechanical clock structure which can reflect the traditional solar terms in China. The clock for marking the solar terms comprises a mechanical plane clock (1) containing a clock face marked with hours, minutes and seconds and pointers (8), wherein the left side and the right side of the plane clock (1) are arranged on a bracket (4) in a spanned way through a rotating shaft (2), the bracket is fixed on a base (7) at the bottom, a mark pointer is vertically fixed at the central position of the back part of the plane clock (1), and a solar term marking plate (6) which is vertical to the base (7) is arranged on a vertical and symmetrical plane at the back of the plane clock (1). The invention has unique sculpt, simple structure and unique style, is similar to a sundial in ancient China, embodies the national styles of ancient China and indicates the unique lunar calendar solar terms, thereby being a novel invention which is completely uniform in contents and forms.

Sundial teaching aid
CN201322851

The utility model provides a simple sundial for teaching in accordance with the sundial principle. The sundial comprises a sundial disk and a pointer, wherein a round hole is arranged in the center of the sundial disk; the lower end of the pointer is matched with the round hole to be inserted into the round hole vertically; an S-pole marked line is engraved on the surface of the sundial disk; a 12-o'clock marked line is engraved at the reversal extension line of the S-pole marked line; seven marked lines are engraved from the 12-o'clock marked line to the right side at the interval of 15 degrees by passing through the center of the circle and respectively represent 1-7 o'clock from the 12-o'clock marked line to the right side; seven marked lines are engraved from the 12-o'clock marked line to the left side at the interval of 15 degrees by passing through the center of the circle and respectively represent 5-11 o'clock from the 12-o'clock marked line to the left side. With the adoption of the technical scheme, the production cost is low, the assembly is simple and convenient, and the principle is clear; therefore, the sundial is suitable for classroom teaching, so as to be convenient for the students to understand and grasp the sundial timing principle.

North latitude 35-degree sundial teaching aid
CN201322850

The utility model provides a north latitude 35-degree sundial teaching aid. The sundial teaching aid comprises a sundial disk and a gnomon, wherein the back surface of the sundial disk is provided with supporting legs in different heights; the center line of the sundial disk is provided with a square hole; a bulge at the lower end of the gnomon is matched with the square hole to be inserted into the square hole vertically; an S-pole marked line is engraved on the surface of the sundial disk; a 12-o'clock marked line is engraved at the reversal extension line of the S-pole marked line; seven marked lines are respectively engraved from the 12-o'clock marked line to the right side at the intervals of 8.7 degrees, 18.3 degrees, 29.8 degrees, 44.8 degrees, 64.9 degrees, 90 degrees and 115 degrees by passing through the center of the circle, and respectively represent 1-7 o'clock from the 12-o'clock marked line to the right side; seven marked lines are engraved from the 12-o'clock marked line to the left side by passing through the center of the circle and respectively represent 5-11 o'clock from the 12-o'clock marked line to the left side. With the adoption of the technical scheme, the production cost is low, the assembly is simple and convenient, the principle is clear, and the timing error is very small.

SUNDIAL
WO2008015004

The sundial (10) has a number sheet (12) and a gnomon (14), whose image (18) caused by sunlight on the sheet forms a pointer on the sundial. A sensor device (20) detects an actual position (Pist) of the image of the gnomon on the sheet. A clock (26) provides a reference position (Psoll) of the image of the gnomon on the sheet. A comparator device (24) compares the actual position with the reference position. An adjusting unit (30) adjusts the position of the gnomon based on a signal outputted from the comparator device, so that the actual position corresponds to the reference position.

Bottle type mean solar time sundial with orientation and location function
CN201166784

The utility model relates to a multifunctional bottle-like mean solar time sundial with orientation and positioning functions. The sundial comprises a combined projection bottle body, a projection needle rod, a projection bottle holder, a semi-circular positioning dial surface, a semi-circular time dial surface, a dial surface holder, an upper cover, a box body and a sun shadow calibration rod. The axial line of the projection bottle body and the axial line of the semi-circular dial surface are positioned on the same line. A time scale baseline is circumferentially formed on the semi-circular time dial surface and a plurality of time scale lines are axially formed on the semi-circular time dial surface. Hour numbers of the spring half year (i.e. a half year from the winter solstice to the summer solstice) and the autumn halt year (i.e. a half year from the summer solstice to the winter solstice) are marked on the two sides of the entire time scale lines. The multifunctional bottle-like mean solar time sundial is easy to carry and is used for measuring the local geographic latitude and meridian line direction and for indicating the local mean solar time. When the current time of a standard time zone is determined by other clocking or timing devices, the multifunctional bottle-like mean solar time sundial can also determine the local geographic longitude, thereby accurately determining the local geographic position, and indicate the standard time of any designated standard time zone as well.

Upright type mean sun sundial capable of providing sunshine drawing of the whole year
CN201141997

The utility model provides a vertical pole sundial capable of displaying mean solar time and annual sunshine graph of a selected certain standard time zone, which comprises a plurality of replaceable gnomon surfaces and a vertical pole vertically standing at the middle of a horizontal gnomon surface. Three groups of scale curves are marked in the regions with the vertex of the vertical pole on all of the gnomon surfaces, where the sun shadow is projected, i.e. Winter-Spring-Summer half-year scale curve, Summer-Autumn-Winter half-year scale curve and solar term curve. The gnomon surfaces are made of paper or other thin film materials and can be replaced for use in different areas. The vertical pole sundial can directly display the mean solar time and the time and the direction of sunrise and sunset, and can provide the annual sunshine graph of a certain area. The sundial can also be designed to a fixed sundial structure only suitable for a certain area.

Principle demonstrator for sundial
CN201138533

A sundial principle demonstration instrument relates to a geography teaching aid. The utility model provides a sundial principle demonstration instrument which can intuitively demonstrate the contents like the sundial principle and the height angle of a sun; the utility model is provided with a geoid, a magnet, a sundial, a spin axis and a base; the magnet is arranged in the geoid; the sundial is arranged on the outer surface of the geoid; an iron piece or a magnetic piece is arranged on the sundial; the sundial is correspondingly sucked with the magnet; the spin axis is arranged on the axes of the south and north poles of the geoid, namely the spin axes of the geoid; the spin axis and the geoid are rotatably connected; the spin axis is fixedly connected with the base directly or indirectly.

Triple projection surface sundial
US6009628

The present invention is a sundial having first and second spaced parallel planar projection surfaces, the first projection surface defining a summer projection surface and the second projection surface defining a winter projection surface. A gnomon extends perpendicularly between the summer and winter projection surfaces. The gnomon is positioned relative to the summer and winter projection surfaces so that with the sundial in an operative alignment with the parallel projection surfaces parallel to the equatorial plane of the earth, on sunny days a shadow is cast by the gnomon on the summer projection surface during those days when the sun rises above the equatorial plane in the northern hemisphere and a shadow is cast by the gnomon on the winter projection surface during those days when the sun does not rise above the equatorial plane in the northern hemisphere.

UNIVERSAL HELIODON-SUNDIAL
US6523270

An apparatus for use with a source of light including a first orientation device that includes a latitude scale, a latitude pointer rotatable about a first axis relative to the latitude scale, and a platform configured to support an architectural model. The platform is mounted on the latitude pointer such that rotation of the pointer about the first axis produces a corresponding change in the position of the platform relative to the latitude scale. The apparatus also includes a second orientation device that includes a time scale and a time pointer rotatable about a second axis relative to the time scale. The first orientation device is mounted on the time pointer such that rotation of the time pointer about the second axis produces a corresponding change in the position of the platform relative to the time scale without changing the position of the platform relative to the latitude scale. The apparatus further includes a third orientation device that includes a day of the year scale, a gnomon operatively oriented relative to the day of the year scale, and a universal joint supporting the third orientation device for movement relative to a source of light. The second orientation device is mounted on the third orientation device such that movement of the third orientation device on the universal joint produces a corresponding change in the position of the platform relative to the source of light without changing the position of the time pointer relative to the time scale or the position of the platform relative to the latitude scale.

Reflected spot sundial
US5197199

A sundial is described using a mirror to reflect an indexing spot of sunlight onto the back of a translucent dial face that is marked with time and date indicia. Adjustments are provided so that a sundial designed for any location can be used in another location and still provide accurate zone time and date.

Sundial arrangement
US4656748

The present invention relates to a sundial arrangement comprising a screen portion provided with several slits allowing the passage of a narrow flat beam of solar rays and angularly spaced from one another to be successively traversed by the beam; a dial with several hour graduations; and a control circuit for bringing into operation a system of devices for filling containers, each representing a predetermined elapsed duration when filled up with water every time a slit is traversed by the beam of solar rays at a precise hour.

Sun and star time dial
US4103429

A combination nocturnal and sundial celestial timepiece comprising a horizontal base marked with the cardinal points of the compass with a central post having an east-west adjustable pivot at the center of a vertical protractor or latitude scale depending in a vertical plane with spaced oppositely extending legs with aligned apertures for setting the protractor at the latitude of the observer so that the apertures align with the polestar, when the protractor is in the vertical north-south plane. Mounted around and pivoted on a hollow sleeve through the aperture at the upper end of the protractor are a circular date and time dial and a pointer; the outer periphery of which dial is calibrated in the days of the year and can be set for the date with the edge of the protractor and the inner peripheral dial is calibrated in the 24 hours of the day. Either this edge of the protractor or the adjacent end of the pointer may have an arc for compensating the exact longitude time with that of the time zone for indicating on the time dial the zone time of the day. The other end of the pointer diametrical of the dial extends beyond the periphery to provide a notch or aperture through which a pointer star of the Big Dipper may be sighted from the aperture at the lower end of the protractor, so that the pointer reads the time of the night on the time dial. This other end of the pointer also has a gnomon with an aperture therein and, spaced intermediate the ends of the pointer, a post with a central line for alignment of the pointer and the gnomon with the rays from the sun so that when sunlight from the sun shining through the gnomon's aperture falls on the line of the post, at which alignment the pointer will indicate the time of day.

Sundial
US4102054

A sundial which is adjustable with respect to its mounting location to correct for its earth location in both longitude and latitude. The sundial is provided with solar time equation indicia and indicator to correct real solar time to mean solar time and includes further indicia to determine the calendar date based on sun declination.

SUNDIAL
US5181324

A sundial including a strip-shaped body with surfaces substantially in the form of helicoids. The body is made of a rather thin material. At least one of the helicoids is provided with time markings. As a result, the sundial is very simple to manufacture, and it is very easy to set up. Moreover, it is very easy to read the time, even at a relatively long distance.

Sundial
US4081911

A sundial comprises a body portion having a cylindrical wall. A gnomon is connected to the body portion to cast a shadow on the cylindrical wall. A pair of flexible sheets are alternately mountable on the cylindrical wall. Fasterners allow rotation of the sheets about the longitudinal axis of the cylindrical surface to correct for differences between local civil time and standard time of the time zone of observation. The time lines are configured in accordance with the equation of time. Each sheet contains time lines which designate the time occurring in either the fall or spring solstice.

EQUATORIAL SUNDIAL WITH SIMPLE TIME AND DATE INTERPRETATION
US6871407

This invention represents an improvement to an equatorial sundial comprising an independent simultaneous single scale indication of both time and date as represented from a primary and secondary gnomon. This allows one unfamiliar with the physics of an equatorial sundial to with simple observation quickly assess both time and date as a singular measurement. The sundial displays conventional time measurement on a single scale transcribed on the equatorial ring from a primary gnomon aligned with the polar axis. The improvement includes a date scale transcribed on the primary gnomon that is cast a shadow from the secondary gnomon comprised of the upper equatorial ring.; Since the sun maintains an essentially equivalent angle of declination throughout the day, the shadow cast by the upper equatorial ring (secondary gnomon) on the primary gnomon (containing the date scale) remains consistent in position and date can be observed at any time of the solar day.

Sundial apparatus
US5062212

A sundial apparatus is arranged wherein a sundial head mounts a semi-cylindrical sundial face mounting a vertical and horizontal cross hair to define time of day, as well as an associated weekly period during a solar year. The sundial face is mounted within a head member that in turn is rotatably mounted upon an upper rotater plate. The upper rotater plate is pivotally mounted between first and second "L" shaped support plates, and the "L" shaped support plate is rotatably mounted upon a mounting plate, with the mounting plate fixedly secured to a support member such as a post.

Holographic sundial
US5732473

A holographic sundial comprising a hologram made using a holographic recording apparatus including a light-sensitive recording medium, a three-dimensional model, in one or more parts, bearing a plurality of indicia over a range of angles corresponding to hour angles of the sun, illumination of the three-dimensional model such that light is incident on the light-sensitive recording medium from every angle of the three-dimensional model in a manner conformal to the represented hour angle, and a reference ray of light incident on the recording medium from one angular direction which defines the angular direction for viewing the recorded image. The hologram, under direct illumination by light from the sun, produces a continuously varying image which indicates the time of day.

Geographical sundial
US4520572

A sundial comprising a transparent hollow globe marked with latitude and longitude lines and including a map of the world is mounted on a stationary base. The globe is adjustable with respect to the base to enable the polar axis to be inclined toward a geographic pole of the earth and to permit alignment of a desired geographic location on the map with an index point. A reflector is mounted at the center of the globe and focuses an image of the sun onto the interior surface of the globe. The image traverses the globe as the earth rotates, thereby tracking the actual path of the sun with respect to the earth on the globe surface.

Sundial
US6367158

An equatorial sundial apparatus with an adjustable base assembly utilizing one or more concave cylindrical focusing mirrors. One of the benefits that is derived from this apparatus is the use of one or more concave cylindrical mirrors to project a focused beam of light onto a calibrated surface from which the time can be read. This sundial has the additional benefit of not suffering from blurring of the time indicator in a shadow or non-focused beam of light typical of other sundials. This sundial's focused light forms a sharply demarcated indicator from which time can be read to the minute. A further benefit of this apparatus is the ability to incorporate multiple concave cylindrical focusing mirrors to reduce the size of the visual field or screen where the time is read and to incorporate various shapes and designs for ornamental purposes without significant compromise of the sundials accuracy for telling time. An additional benefit of this apparatus is the ability to quickly, accurately and easily adjust the apparatus to the proper tilt upon setup according to the latitude where it will be located by means of an adjustable base assembly.

Equatorial sundial apparatus utilizing one or more concave cylindrical focusing mirrors
US6301793

A sundial for indicating the time of day using the position of the sun having a labyrinthine body with a plurality of pathways connecting a first and said second face, each pathway being adapted either to transmit said ray of light from an entry end at the first face to an exit end at the second face or to absorb said ray of light depending on the solar position so that the second face indicates visibly the time of day.

Sundial capable of recording equator plane clock
CN2724060

The utility model relates to an apparatus for astronomy, in particular to a sundial capable of recording equator plane clock, comprising a square plate on which an upper sundial needle, an upper sundial surface, a lower sundial needle and a lower sundial surface are provided. The sundial capable of recording equator plane clock is characterized in that the vertical bank angle for the arranging position of the square plate is the same as the latitude of the location. After use, the angular changes of sun shadow after hourly time changes can be found to be uniform, and the angular changes of daily sun shadow are also uniform.

Sundial capable of recording horizontal surface
CN2724059

The utility model provides a sundial capable of recording horizontal surface, comprising a sundial plate and a sundial needle. The sundial capable of recording horizontal surface is characterized in that the sundial plate is placed horizontally, and coordinate recording paper is arranged on the sundial plate; the sundial needle which is perpendicular to the sundial plate is arranged at the origin of coordinates of the coordinate recording paper. The sundial capable of recording horizontal surface can solve technological problems of recording sun shadow directions and the changing tracks of length in one day.

Seasonal equator sundial
CN2699403

The utility model relates to a seasonal equator sundial which can be used to confirm time and solar terms through observing the shadows of objects in the sun. The seasonal equator sundial is mainly applicable for the teaching of natural sciences in primary schools, the teaching of astronomy and geography in middle schools, etc. The seasonal equator sundial comprises a sundial surface 1 and a sundial needle 2, the sundial surface 1 appears as an annular disc, and the sundial needle 2 is vertically inserted in the center of the sundial surface 1. The seasonal equator sundial is characterized in that scales of traditional twelve two-hour periods and modern twenty-four hours are carved on the sundial surface 1, a movable meter 3 which is vertically arranged on the edge of the sundial surface 1 can rotate around the center of the sundial surface 1, and scales of twenty-four solar terms are arranged on the movable meter. The seasonal equator sundial can better help teachers explain and make students understood the principle and usage of the equator sundial which is an ancient astronomical instrument in China, and also can make up some disadvantages existing in prior equator sundials. The seasonal equator sundial has small volume, scientific design, portability, and accurate measurement, both time and solar terms can be measured, and the solar terms can be known as long as solar radiation is available.

Upward-looking bowl sundial with automatic recording function
CN2694231

The utility model relates to an upward-looking bowl sundial with automatic recording function. The upward-looking bowl sundial is invented by Guo Shoujing who is a great ancient Chinese astronomer, and is especially used for measuring solar azimuth and upward-looking angle. The utility model provides an upward-looking bowl sundial with automatic recording function that comprises a pedestal (1) and a transparent hollow hemisphere (2) that is arranged on the pedestal (1), the opening of the transparent hollow hemisphere (2) is upward, the transparent hollow hemisphere is arranged horizontally, and longitudes and woofs are evenly distributed on the hemisphere wall. The upward-looking bowl sundial with automatic recording function also comprises a glass ball (3) that is arranged at the center of the transparent hollow hemisphere (2) and is connected with the pedestal (1) by a bracket, and the circle centers of the glass ball and the transparent hollow hemisphere (2) are same. The upward-looking bowl sundial with automatic recording function provided by the utility model has simple structure and easy use, and can provide for teenagers to learn astronomical knowledge and know the regularity of the earth revolution surrounding the sun and the earth rotation and the change of the solar terms, climate and sunlight produced by the earth revolution surrounding the sun and the earth rotation.

Instrument for automatically tracking sun
CN2689173

The utility model relates to an instrument for automatically tracking sun. Intelligent laboring people of China in ancient times can make observe the position of the sun by making sundial. Therefore, the utility model provides the instrument for automatically tracking sun, essentially including a supporting base (1), a middle circle (2), a small circle (3), two servomotors (5, 6) and a set of speed reduction gearing (7). The speed reduction gearing (7), the two servomotors (5, 6), a big circle (11), the middle circle (2) and the small circle (3) are connected. The instrument for automatically tracking sun provided by the utility model is of simple structure and convenient use, and the instrument for automatically tracking sun can accurately display the orientation, the elevation angle, the true solar day and the stepout of the sun, measure vicinal illumination angle at the times of the solar terms of spring equinox, autumnal equinox, winter solstice, summer solstice, etc., and display the positive southern direction and the declination of measuring position and the longitude and the latitude of located position.

Automatic tracking sundial
CN1734523

The invention relates to an automatic tracking corona device, which comprises the following parts: two groups of horizontal conical glass tube (1); U-shaped polymethyl methacrylate photoscreen (2) under the glass tube (1); bilateral solar battery board (4) among the photoscreen (2). The glass tube (1) center of circle is the same as photoscreen (2)'s. The solar battery board (4) connects control motor, which displays sun orientation and elevation angle precisely.

Water lens type upward-looking bowl sundial
CN1734234

This invention relates to a water-through mirror-raising device, which provides a water-through mirror raising device which comprising the following steps: sawing out a white spherical plastic lampshade as a translucent spherical photo screen (2), putting the opening upwards, fitting orientation graduated dial (1) along the translucent spherical photo screen (2), fitting the altazimuth all-around the photo screen (3), using rack (4) in the middle to pick up a glass-spherical flask (5), filling the flask(5) with full of pure water, when sun shining on the glass-spherical flask(5).We can see some light-spot on the each end of the spherical photo screen(2) through refraction by the pure water . According to the location of light spot, the orientation graduated dial (1) and the altazimuth all-around the photo screen (3), we know the orientation and height of the sun.

Equatorial sundial for time and solar term
CN1570782

This invention relates to a equatorial day GUI which is to determine time by observe object shadow cast by the sun and comprises GUI round surface one and QUI needle two centered on the surface. It is characterized by nicking traditional twelve time and modern twenty-four hour scales on QUI surface one on skirt of which is vertically located movable meter three which rotates around the center of the surface one with twenty-four solar terms nicked on. This invention can help teacher to explain to students the principles and method about how this ancient astronomical instrument - equatorial day GUI works and compensate for the current equatorial day GUI

Sun clock
CN2184216

The utility model relates to a sun clock for measuring time by sun shadow. The utility model is composed of a sundial tile, a sundial needle, a small steel ball, a diagram character piece, etc. The utility model is characterized in that a sundial, a gnomon and a time difference curve are combined, and sun shadow on the diagram character piece is used for obtaining standard time and reading out season and solar term in current day. The utility model can be used at areas with different longitudes and latitudes and has the advantages of high reading precision and convenient installation and correction. The utility model has a positive significance for promoting national culture, popularizing astronomical time measuring knowledge and exciting science consciousness.

SUNDIAL TIME-MEASURING COMPASS-TYPE TOY
CN2093683

The utility model relates to a sundial time-measuring compass-typed toy which adopts the sundial time-measuring principle and comprises a disc, a needle, a compass and corresponding time scales, wherein, the compass can rotate in an arc-shaped groove to adjust the time difference between the summer time and the winter time. The sundial time-measuring compass-typed toy is marked as six o'clock of the morning when an angle beta is 138 DEG, and each movement of the central angle of 15 DEG means the increasing or reducing of an hour. The utility model is favorable for children to master the relations among the time metering and the motions of the earth and the solar and is beneficial to illumine the intelligence of the children and increase the thinking ability of the children, and the utility model is a fancy toy and an ornament manufactured by using the natural law.

MULTIPURPOSED SUNDIAL
CN85202173

The utility model relates to a multipurpose sundial applied to a time measuring device for the interposition change of the sun and the earth, which aims at developing a timing device using the rule of the interposition change of the sun and the earth, comprising a dial device, a base, and connecting pieces. The dial device comprises a south and a north dial boards, a dial meter and a horizontal line. The base comprises a base body and a latitude board. The sundial can distinct time and direction of sunrise and sunset, can indicate the solar term and can measure the time and the meridian. The utility model can be used as a teaching aid in teaching, a toy, and can also be a decoration for a garden, a temple, a tourist resort, a road side and a building.

Sundial or solar clock or timepiece of horizontal type..
CH687572

The horizontal sundial has a stylus of which the shape is projected on at least a graduation of hours. The graduation is circular and has regular increments. The time is given by the intersection of the stylus projection with the graduated part. The inclination of the stylus w.r.t. the horizontal plane is a function of the latitude of the location of the sundial. The stylus is displaceable linearly w.r.t. the hourly graduation following its diameter, such that the eccentricity of the stylus can be determined for each day of the year as a function of the latitude of the sundial and of the declination of the sun at that location w.r.t. the day of the year.

FIXED-GNOMON STANDARD-TIME SUNDIAL
CA2272120

A  sundial consists of a gnomon which serves to cast a shadow, and a face on which the shadow is cast, which is marked so that when the sundial is illuminated by sunlight, the position of the shadow indicates the time. In a conventional sundial, the face has a curve with times marked on it, and the gnomon casts a shadow which has a straight edge so that the time is indicated by the position on the curve where the curve is crossed by the straight edge of the shadow. Such a sundial indicates time in solar time so that to ascertain the time in standard time, it is necessary to add to or subtract from the solar time a correction amount which varies throughout the year. This invention is a sundial in which the part of the gnomon's shadow that indicates the time is not an edge but a single point, and every point on the face indicates a time instead of just points on one curve. The face of this invention ca.n be marked so that it indicates the time accurately in standard time. I call this invention a Fixed-Gnomon Standard-Time Sundial.

Horizontal sundial adjustable for accurate reading at multiple latitudes
US6308427

A horizontal sundial constructed to accurately tell time at a specific latitude having female threads incorporated into both the north (10) and south (12) sides of the dial plate (6). Threadedly matched male gnomon angle-adjusting bolts (18) serve to raise either the north or the south end of the dial plate and gnomon. This serves to bring the gnomon to the same angle with the horizontal as the latitude of intended use. The female threads (10) & (12) can be located on the face of the dial plate (6) to establish a simple mathematical relationship, such that a one degree change in gnomon elevation will correspond to a whole number of revolutions of the gnomon angle-adjusting bolts (18).

SUNDIAL
US3786570

An improved sundial comprising a reflective surface member supported in a plane parallel with the earth's axis and adapted to receive and reflect sun rays; a non-reflective line inscribed along said reflective surface parallel to the axis of the earth's rotation and adapted to project a shadow; a translucent semicylindrical member projected over said surface and co-axial about said line, the surface of said cylinder carrying a time scale observable from the exterior of the translucent member such that the shadow is highlighted by a bright sunlit outline of reflected sun rays with said shadow indicating the time of day.

Plate sundial with installation indicia
US4924592

A typical plate and gnomon sundial with an enlarged dial plate and an extended gnomon is provided with latitude and longitude displacement indicia lines on the dial plate, beneath the gnomon and beyond the time indicia. A point is established on the gnomon from which a plumb line to the latitude and longitude displacement indicia lines can be determined. The latitude and longitude displacement indicia lines are placed so that when a plumb line from the point on the gnomon intersects the point of intersection of the site latitude indicium line with the site longitude displacement indicium line, the gnomon will be inclined to the horizontal at an angle equal to the latitude of the site and the plane(s) containing the gnomon and the 12 o'clock noon indicium line(s) will be inclined to a vertical plane containing the gnomon at an angle equal to the difference between the longitude of the site and the longitude of the time zone meridian. Set up is accomplished at the site by plumbing from the point on the gnomon to the point of intersection of the site latitude and site longitude displacement indicia lines, and while holding this attitude rotating the sundial on a horizontal surface until the correct zone time is indicated by the shadow of the gnomon from the sun on the time indicia. This will mean that the sundial is correctly oriented and will continue to indicate correct zone time.

Hemispherical sundial with installation indicia
US4945644

A sundial with a concave hemispherical body and top surface generally horizontal has longitude displacement, latitude, sun declination, and time indicia originating at the spherical gnomon located at the spherical center of the hemisphere. Site set up is accomplished by plumbing the gnomon over the site latitude and longitude displacement indicia and then rotating on a horizontal surface until the correct time is indicated by the shadow of the gnomon from the sun. Two six-month sundials or two removably attachable inserts are used for indication of watch time for complete years.

Columnar sundial
US4384408

A columnar sundial utilizing the projection of the spot image of the sun through a nodus plate onto a translucent projection screen is disclosed. The projection screen is mounted on a support column which has a transparent portion through which the spot image is projected, with the nodus plate closing the upper end of the column. The projection screen is movable on the column to permit adjustment for display of seasonal time and date markings, and the nodus plate is provided with a series of apertures, one of which is selectively uncovered in accordance with the latitude at which the sundial is used. The column preferably is cylindrical with an elliptical cross-section, but may be circular in cross-section, and may have a non-cylindrical shaped surface.

Sundial
US4373270

A sundial comprising a block of transparent material in the general form of a frustrum of a semi-cylinder, with first planar surface at an angle to the cylindrical axis that corresponds as nearly as may be to the complement of the angle of latitude at which the device is to be used, a second diametrical surface that has a medial index or gnomon line coincident with the cylindrical axis, and with a plurality of concave flutes on the cylindrical surface extending parallel to the cylindrical axis and providing, between adjacent ones, narrow, flat, translucent, substantially linear surfaces fifteen degrees apart.

Universal sundial
US4922619

A sundial has a scale 3 on the inner face of a single-turn helix 1, and a gnomon 2 which is a rod or wire lying along its axis. The scale is linear and the instrument can be used at substantially any location, regardless of latitude or longitude. It can be advanced for statutory Summer Time, and adjusted to compensate for non-linearity in the sun's apparent movement ('Equation of Time').

SHADOWLESS SUN DIAL
US3815249

A sundial is formed with a reflecting surface curving in an arc around an axis so that the image of the sun reflected from the surface can be viewed from points along the axis. The surface is mounted with its axis parallel to the axis of the rotation of the earth, and a time scale, also visible from the axis, indicates the time position of the reflected image of the sun.

Equatorial sundial
US4355470

An equatorial sundial according to this invention includes a dial surface and an elongated, rod-like gnomon fixedly secured in operative relation thereto. The dial surface is generally semi-cylindrical and concave toward the sun. The circumferential portion of the surface is further formed in the shape of a partial helix. The gnomon lies on the axis of the dial surface such that the longitudinal extent of the surface is transverse of the gnomon at an obtuse angle thereto. In a given geographical location, the sundial is so oriented relative to the earth that the gnomon is parallel to the earth's axis of rotation. With a proper pitch of the helical form of the dial surface, the opposite end portions thereof are offset in a direction parallel to the axis of the gnomon so that neither shade the dial surface either in the morning or evening.

Sundial
US2004098871

A vertical sundial comprises a substantially flat dial face (2) provided with dial markings and gnomon (3) supported in a fixed position relative to the dial face (2) which in use casts a shadow on a first side of the dial face (2). The sundial is adapted to be free-standing on a generally flat and horizontal surface and the dial face (2) is translucent such that the shadow cast by a gnomon on the first side of the dial face can be observed from the second side of the dial face. The dial markings are adapted to be read from the second side of the dial face to give a time indication.

Direction indicator
US5459931

A direction indicator includes a base defining four edges that extend parallel to a horizontal surface on which the base is placed and form portions of respective sides of a rectangle, a bearing indicator which is selectively positionable on the base for carrying compass bearing information, and a gnomon supported in a predetermined position relative to the direction indicator. The bearing indicator may further contain time markings in the event that it is used as a sundial. The base is adapted to be placed in a predetermined orientation on a horizontal surface. For a given orientation of the base, the direction indicator can be appropriately positioned relative to the base by reference to the direction of a shadow cast by the gnomon at a predetermined time of day and by reference to the bearing of the sun at that predetermined time of day.

Sidereal sundial
US6604290

By adding an opaque ecliptic half-plane (24) to a partially open or transparent equatorial disk (12) which bears a sidereal hours scale (20), and by being able to rotate this plane (24) and disk (12) jointly in order to minimize the shadow being cast (74) by ecliptic half-plane (24), one can easily determine the local sidereal time using the sun. Understanding its operation draws on a number of basic concepts that a beginning astronomy student should master, and should also interest sundial enthusiasts.

Sundial
US4785542

A sundial which is characterized by a selectively portable or permanent base, a support plate hingedly connected to the base in adjustable angular relationship for effecting latitude adjustment to the sun's path and a connecting plate pivotally attached to the support plate, with a pair of semicylindrical dials secured to the connecting plate in oppositely-disposed relationship. A pair of gnomons are suspended outwardly of the concave dial curvatures, respectively, for casting a shadow on the dials and indicating the time of day and day of the year responsive to rotation of the earth and traversal of the shadow across the dials. Each gnomon is spherical in shape and is suspended in the center of a diameter of each of the dials and the connecting plate and dials are oriented at a selected angle with respect to the base, which angle is determined by the latitude at which the sundial is positioned. Each of the dials is further provided with hour and month markings to facilitate direct reading of the time of day and the approximate day of the month on the dials responsive to the sequential casting of the shadow by the gnomons.

Modern sundial
US4346521

The disclosure relates to a sundial employing a new type of gnomon comprising an opaque design printed on a plate of transparent material. The sundial described is designed for use in a specific locale, thereby enabling greater accuracy. The design of the casing of the sundial is therefore influenced by the choice of where it is to be used.

WRIST-SUNDIAL WITH INCORPORATED COMPASS
SI20129

The historically known sundial is bound to a fixed place and on a given location oriented along the line of the astronomical time XII/1200/ N-S. By adding a compass (3) to the analemma (1), a mobile dimension is obtained, as the right orientation can be set anywhere. The wrist-sundial with the compass, wearing a folding gnomon (2) may be carried out as a wristwatch or a little bigger upper arm watch. The given solution of a wrist-sundial with the built-in compass is foreseen as an advertising and tourist article.

Method of indicating time on the time scale of a sundial
SE469807

In a method of indicating time on the time scale of a sundial, use is made of a mirror 1 and a holder to hold the mirror in a selectable position. The mirror 1 is adapted so as to project a solar reflection 6 onto the time scale 7 and thus indicate the time.

EQUATORIAL SUNDIAL
RU2200339

FIELD: instruments determining time by the Sun. SUBSTANCE: equatorial sundial has base which upper part includes plane parallel to plane of celestial equator and is fitted with elements fixing dial. Summer time gnomon is installed on upper surface of dial, in center of circumference of reading scale of summer time and lower surface of dial carries winter time gnomon mounted in center of circumference of reading scale of winter time. Center of circumference of reading scale of winter time is displaced with reference to center of circumference of summer time by value ( 0.5-1.0 )R where R is radius of circumference of reading scale of winter time. Reading scale of summer time has displacement diagram of reading point of local time relative to shadow cast by gnomon. EFFECT: capability of time reading in winter season, increased convenience of sundial handling and accuracy of local solar time reading

EQUATORIAL SUNDIAL
RU2200340

FIELD: instruments determining time by the Sun. SUBSTANCE: equatorial sundial has base with column which upper part carries winter time gnomon mounted for angular movement and position fixing in vertical plane. Summer time gnomon and circle of hour angles made of transparent material are anchored on upper end of winter time gnomon. Base has sight and circle carries reading scale of apparent time and displacement diagram of reading point of local time relative to center of shadow that comes in the form of graph of time equation marked on image of shadows cast by gnomon. EFFECT: capability to read time in winter season, increased convenience of sundial handling and accuracy of reading of local solar time.

SPONTANEOUS AZIMUTH ORIENTATION MECHANISM AND SUNDIAL EQUIPPED THEREWITH
JP2003066166

A spontaneous azimuth orientation mechanism by which a line connecting the horizontal component direction of the projection axis line of a time projection plate or a projection rod at a sundial to the magnetic pole of the earth or the south-north of the earth's axis is set simply to be horizontal, and by which the face of a time display board is set simply so as to be held horizontally. SOLUTION: The sundial as a whole is constituted of a float-type pedestal 4 in which a magnet 4 is built in a magnet mounting part formed under the face of the time display board 11, and it is made to float on a liquid such as water, oil or the like so as to be spontaneously azimuth-oriented and horizontally held.

HOLOGRAM SUNDIAL
JPH03202800

PURPOSE:To improve decorative appearance of a sundial thereby to increase the attention of a user by memorizing holographic interference fringes agreeing in number to reference lights in directions corresponding to a plurality of time points onto a photosensitive material. CONSTITUTION:A laser light is divided into two, one being projected to an object 4. A reflecting light or passing light of the one light projected to the object 4 is made an object light 2 and interfered with the other divided reference light 1. Accordingly, a photosensitive material 3 as exposed. Thereafter, an object light 7 and a reference light 5 from another object 6 are interfered to expose the material 3 which remains undeveloped. The direction of incidence of the first reference light 1 upon the photosensitive material 3 is made coincident with the direction of the sun beam at a specific time of a certain season. Moreover, the direction of incidence of the second reference light 5 is agreed with the direction of the sun beam at a different time. The number of times of the multiplied exposure is set for each time by dividing the radiating time of the sun. The recorded hologram becomes reproduced lights 1', 5' under the sun beam and the images of the objects recorded by the reference lights 1, 5 corresponding in direction to the sun beam at that time are reproduced as virtual images

TOP TYPE SUNDIAL
JPH09127268

PROBLEM TO BE SOLVED: To obtain a top type sundial which can be understood easily by specifying the intersection of a projection rod and a dial, and the graduation equal to those obtained by translating a flat sundial at a latitude remote from the pole thereby eliminating the difficulty at the time of reading the graduation. SOLUTION: The top type sundial comprises a dial 1 where the north face side (summer season side) is perpendicular to a projection rod 4 just like a conventional one but the south face side (winter season side) is inclining by 70 deg. against the projection rod 4. The south face dial 1 is provided with graduations at latitude of 70 deg.. When the sundial is installed in accordance with the latitude and longitude of setting point, an adjusting screw 3 is fixed to a surface 2 being cut off in order to eliminate substantially upper half of the dial 1 having no relation with the projection rod 4. The length from a point 6 where one end of the projection rod 4 touches a horizontal base 5 to the point 7 of screw 3 is adjusted such that the angle between the projection rod 4 and a horizontal plane matches the latitude at an installing place and then the screw 3 is tightened. More specifically, a flat sundial at a different latitude is translated thus eliminating the difficulty at the time of reading the graduation thus facilitating the understanding.

OBSERVING APPARATUS FOR POSITION OF SUN
JPH04155210

PURPOSE:To obtain a simple educational apparatus for observing a position of the sun by providing a frame body with a measuring disk which can rotate around a horizontal axis, a semi-arc-shaped scale plate, a coupling beam, a measuring cylinder which can rotate perpendicularly to the horizontal axis and a gradient angle measuring means. CONSTITUTION:A measuring disk 20 is rotated around a horizontal axis 21 and tilted similarly to sunlight with respect to a frame body 10 and fixed. A measuring cylinder 40 is rotated around an axis 41, and is set and fixed so that light passing through a through hole 43 is positioned at the center of a shadow of a top plate 42 projected on a belt-like scale plate 22. When a position of the top plate 42 and a diameter of a hole 44 are appropriately set, a bright region at the center of the shadow of the top plate is reduced as time goes, so that the sun which is gradually moving can be visually observed. In addition this apparatus can be used to measure latitude and also can be used as a sundial.

SUNDIAL AND CONSTELLATION CLOCK
JPH1039053

PROBLEM TO BE SOLVED: To provide a sundial and a constellation clock whose accuracy and applicability are high even in a narrow place by making use of an arc and the meridian line. SOLUTION: In a sundial, an arc 2 is formed, by a support 3, on an orbit at right angles to a column 1 from a spring and autumn equinox 4 in the center of the column 1, and the support is fixed in a winter solstic point 5 and a summer solstitial point 6. Days on an arbitrary observation scale 8 calculated by 91 days are engraved sequentially up and down from the spring and autumn equinox on the column sandwiched between supports. When an arbitrary object day which is engraved is observed, the time in which the sun is moved along the arc and a position in which the sun rises and sets are found so as to be applied to a constellation clock. The subdial and the constellation clock can be used in any place on the earth, they can be made large without a need of a large place, and they can be used as a plaything.

NORTH SOUTH INDICATOR
JPS56107114

PURPOSE:To find the exact north-south direction by a method wherein scale divisions at nearly equal intervals are provided on the main body of an instrument by using the principle of a sundial of a horizontal type, the tilt of the main body of the instrument is adjusted in accordance with the latitude of a given place, and a time indicated by a projecting body based on sunrays is made to accord with a correct time. CONSTITUTION:A point A determined by a line OB equaling 8cm and being perpendicular to a line O out of the shadows -VI of the projecting body positioned at a point 0 formed at noon to 6:00p.m. and by a line BA equaling 4cm and being perpendicular to the line OB is taken, a circle is drawn with the radius of AM equaling to 18cm, and the intersecting points of the circumference of the circle with the lines indicating 1:00p.m. to 6:00p.m. are determined to be C-L. Under the condition, angles theta12-theta6 are found to be at nearly equal intervals and thus the sundial at the latitude of 45 deg. is obtained. Scale divisions for 6:00-12:00a.m. are obtained in the same way. At a point of place whose latitude is psi, aforesaid divisions 6 are provided on a supporting plate 7 titled at an angle of 45 deg.-psi to the horizontality. A square projecting plate 1 having sides equal in length to a distance between two points of the position O, O' at noon is fitted, with a tilt of 45 deg., to the central position of a segment 5 connecting points at 6:00a.m. and p.m. The right and left sides 2 and 3 of the plate indicate the direction of the North Pole and thereby the north-south direction is found correctly.

DEVICE AND METHOD FOR MEASURING ADVANCING DIRECTION

JPS5749806

PURPOSE:To constitute the advancing direction measuring device of a means of transportion by providing a light receiving plate, on which light receiving elements and light emitting elements are arranged in circular shape so that they face with one to one correspondence, at the outside of a room, and providing a light emitting plate on the same shaft of a sundial type hour display plate in the room. CONSTITUTION:Light receiving ends 3 at the tips of glass fibers 6 are arranged on the circumference of the light receiving plate 2 in 16 bearings at the angle of about 45 deg. from a horizontal plane. Light shielding plates 4 are provided between the individual light receiving ends 3. The glass fibers 6 are bundled, and light emitting ends 11 are connected in a unitary body in the reverse order of bearings (i.e. north and south) with respect to the light receiving ends 3, thereby forming a light display plate 12. A sundial type hour scale 16 is provided in the light display plate 12. The position of the 0 hour faces the light emitting end 11a which is connected to the light receiving end 3a facing the forward direction of the means of transportation. Said position is located at the top of the plate. A bearing display plate 13 which is provided on the same shaft of the light display plate 12 is rotated, and an aligning mark 21 on the plate is aligned with the time of the hour scale 16, and the bearing corresponding to the illuminating light emitting ends 11 is read from a bearing scale 20. In this method the bearing can be accurately sensed as long as the sun is shining.

SUNDIAL

JPH09257959

PROBLEM TO BE SOLVED: To provide a sundial capable of seeing the time from the inside of window pane by mounting the sundial on the window pane not facing the south properly at the positions of different longitude and latitude. SOLUTION: A dial 11 of sundial having a top-like form is made of semi-transparent plate and thereby shadow thereon can be viewed from both sides thereof is used. The dial 11 is turned around an axis 40 and the difference with the longitude of Japan (135 degrees - the east longitude) is adjusted by a scale so that the sundial can be mounted on the glass pane of a building at a place with a different latitude. The sundial comprises further a support member 50 capable fo easily adusted at theangle so that the axis 40 faces the polar star; and a base member 60 with an universal joint.

A New or Improved Compass Sundial.

GB191514858

Consists of a base-plate a which can be clamped on a mariner's compass in true north direction, a hinged dial plate c with rotary pointer e, and a latitude arc b by which the dial plate is set in the equator, with vernier adjustment d. The pointer carries a lens h and mirror i by which an image of the sun is cast on the index line.

Improvements in or relating to Sundials.

GB191302956

An instrument for use in connexion with sundials, when set for any particular day and according to the longitude of the place at which it is used, indicates the correction necessary to obtain standard mean time (for instance Greenwich time) from a sundial reading. The instrument comprises two relatively-movable plates A, B, bearing date, time, and longitude scales. In the device shown, a pointer C is connected by an arm c<2> and a slotted lever c', Fig. 2, to the plate B, so that when this plate is set with respect to the plate A according to a given date, using the scales a, b, the pointer shows the equation of time correction on the scale D. The pointer is independently adjustable, so that when originally set according to the scale E, allowance for longitude is also made. In another form, the device comprises an annular plate rotatable around a fixed disk, over which the pointer moves, the movement of the pointer being controlled by means of a cam-groove on the underside of the rotary ring.

Improvements in Sundials.
GB191225222

Relates to the type of sundial described in Specification 1103/61 which comprises a dial 1, and a rotary gnomon 4 with a pin-hole 8 and a fiducial line 9. A middle plate 10 is provided as well as the indicating-plate 13 with a minute-scale 16. The .dial is graduated distinctively for both hemispheres, to be read with the aid of a reversible plate of numerals 20, and a wedge equation scale, Fig. 3, is supplied. With the gnomon fixed by a pin in a hole 26, the middle plate can be clamped thereto with the indicating- plate reading solar time, either local or standard ; while to read mean time, the indicating-plate is set on the middle plate by inserting the wedge between pins 17 and 18 or 19 thereon. The edge of the wedge is also graduated for setting the dial to the latitude ; it is hooked by the notch 23 on a pin on the pedestal and applied to the lower edge of the dial.

Improvements in Sundials
GB191219976

In a sundial having a rotary sighting- gnomon, the s l i t part is made adjustable about the axis to allow for the equation of time.

Improvements in Sundials
GB190827002

In a sundial in which the time scale A and the gnomon B are together rotatable about an axis D parallel to the edge of the gnomon, or in which the time scale only is rotatable; when the said axis coincides with the edge of the gnomon, a suitable device such as a spirit-level C, preferably provided with a scale of dates, the divisions corresponding with the equation of time, is attached to the time scale, to indicate by what amount it is necessary to rotate the dial in order to adjust it to show mean time instead of solar time on a given date. The dial may also be adjusted by rotation about the axis D, to show the time at any longitude. Special means employed to erect and adjust the sundial correctly, comprise an equatorial are W fixed to the time scale, a scale of dates S, T attached parallel to the edge of the gnomon, the divisions indicating the product of the tangent of the sun's declination on the given dates multiplied by the radius of the equatorial arc, and a plumbline R, or a spirit-level to indicate the vertical plane through the edge of the gnomon. The erection is carried out as follows :-The time scale and gnomon are rotated about the pivot D, and at the same time moved relatively to the main support of the sundial (not shown), until the shadow of a cross-piece S which is attached to the date scale at the correct division, falls on the division of the arc W that indicates solar time at the moment of erection ; simultaneously the division of the arc W that indicates solar noon is brought into the vertical plane passing through the edge of the gnomon. The apparatus is then clamped. In order to show mean time, the dial is further rotated through the necessary amount about the axis D, and the spiritlevel C is adjusted until the bubble is opposite the correct date on its scale, and then fixed.

An Improved Sundial
GB190826819

The equatorial arc of a sundial is mounted transversely on an arc b, pivoted to the meridian arc c adjustably carried by a stand d rotatably carried by a base-plate f, to which it is secured in position by screws g. A sector o, carried by a bridge-piece p on the main arc, is mounted adjacent to the equatorial arc a and engraved with the minutes of equation, so that the equatorial arc a, which is provided with a rack operated by a pinion s, may be adjusted to allow for the equation of time. A line of light is formed on the equatorial arc by a slit l and a suitable lens n, mounted in a slide on a polar bar i with pivots k

An Improved Sundial and Solar Observation Instrument.
GB190321832

A sun-dial or instrument for ascertaining solar angles, time, and dates of the calendar is described. The construction of the Instrument assumes that a cylinder having its axis parallel to that of the earth is graduated by four sets of lines, namely, circumferences, generatrices, the traces of vertical planes through the zenith, and the traces of inverted cones on a vertical axis. The circumferences mark off declinations, the generatrices the time of day, and the traces azimuths of amplitude and zenith distances, and they are assumed to be read by the intersection of a vertical plane through the sun. The instrument consists of a dial-plate which shows a plan f of half this cylinder when divided by the meridian plane, and an elevation g on the meridian plane, together with a sliding setting- plate m, Fig. 2, and a style, Fig. 4, having a vertical edge. The plans of the circumference lines are omitted from the dial-plate, but the setting-plate presents by its curved edge m<1> a movable plan which is put to suit the daily declination of the sun by means of graduations at a slot n. A further adjustment to suit the equation of time is made by means of noon-graduations m<4> and a curve l on the dial-plate. For afternoon use as a sundial, the setting-plate must be put on the other side of the centre-line and the instrument turned through a semicircle.

SUNDIAL
WO9725656

A sundial having no gnomon comprises a plurality of planar surfaces mounted on a support, said surfaces constituting a sequence, the plane of each surface being tangential to a virtual helix, extending around an axis adapted to be parallel to that of the earth when the sundial is positioned at a predetermined latitude, solar time being indicated by the presence or absence of shadows cast on each face by the sunwards edge of that face.

SUNDIAL
GB1445146

An equatorial sundial comprises a scale 20 with graduations 22 which are read in conjunction with a pointer of light 26 formed by a cylindrical lens 24 having an effective refractive index of less than 1À4. The lens may be formed by a glass vessel containing water with salt or an anti-freeze such as alcohol. As shown the sundial comprises two hemispherical base members 12, 10 fixed together and to a plinth 34. To aid reading near the solstices when the sun lies near the equatorial plane, the scale 20 is extended by a rim 30. Another embodiment is described in which the scale is on a partcylindrical surface coaxial to the lens, allowing the dial to be used all the year round.

Improved compass sundial
GB154526 

Relates to compass sun-dials of the kind described in Specification 14858/15, and consists in substituting for the lens and mirror used in the prior construction a prismatic telescope m, pivotally mounted on a standard n fixed to the pointer e, that moves over the dial plate c. A slit o is provided in the underside of the telescope, so that the rays passing through the telescope are reflected on to the centre-line of the pointer e.

Improvements in sundials
GB500518

  An equatorial, sundial is adapted for use throughout the year by the provision above the dial 11 of a convex mirror 22 arranged to direct sun. light on to the dial. The dial is adapted to be rotated in its plane for adjustment, with the aid of a scale 13 and an index 29, according to the longitude of the place, summer time and the equation of time. A luminous line for indicating the time is formed by the sunlight passing between two triangular shaped, rotatable prisms 16, 17.

Calendar sundial which indicates the ecliptic plane
GB2418998
 

A sundial has a horizontal base 1, a lower wedge 2 mounted on the base, the inclination 12 of which may be adjusted for use at various latitudes, and an upper wedge 4 representing the ecliptic plane rotatably mounted 14 on the upper surface of the lower wedge. The ecliptic plane is inclined at an angle of 23.5 degrees to the upper surface of the lower wedge, the upper wedge being capable of rotation around an axis 14 which is perpendicular to the upper surface of the lower wedge. A dial plate 6 is mounted on the upper surface of the upper wedge. A sighting device 8 has a pinhole 7 which projects a sun beam onto a cross-hairs target 17 when it is correctly aligned by rotating the upper wedge and a pointer plate11 independently. A pointer line 18 permits reading of dates on the dial plate. Time is indicated on the hour scale 3 by use of a pointer line and transfer lines 5. A compass and means to ensure that the base is level may be provided. The zodiac may be displayed on the dial.

Azimuthal mean time sundial
GB2398397

A cylindrical sundial that uses a rotating finger 4 and an alignment strip 6 to find the direction of the sun, and a correction scale 5 together with correction curves 3 to convert solar time to mean time. A further correction scale 7 together with the alignment strip 6 is used to apply the said correction to the time scale 10. The scale 7 is provided on a rotatable collar 8.

Time and date sundial
GB2387675

A sundial consists of an inverted cone onto which is cast the shadow of a pointed gnomon. Analemmas and lines of constant date are inscribed on the sundial from which both the time and the date can be read by observing the position of the gnomon's shadow. Preferably, the angle of the cone is chosen to increase the sharpness of the gnomon's shadow throughout the day and year. The gnomon may be a vertical pointed stick such as a pencil passing through the apex of the cone. The lines may be printed on paper and made available for assembly into a sundial. The lines may be generated for a specific latitude, longitude and time zone.

Sundial showing local or greenwich mean time
GB214034

Greenwich mean time is read on a sun-dial by means of a director OP adjustably fixed to a rotatable disc H and having a curve, Fig. 2, marked on the vane 0, on which curve the image of the aperture Q is brought before reading time on the scale A against the pointer K. The disc H is graduated in intervals of 14 22 and reads as a vernier against the 15 graduations on the fixed plate A, the reading being the nearest hour to the pointer plus or minus the minutes marked on the vernier at the coincident marks of the two scales. The displacement of the image right or left from the median line R when the pointer is at mean time is d tan #, d being the distance between Q and 0 and # being the angle in degrees corresponding to the equation of time. The value of # is obtained by multiplying the difference of time in minutes by 4. The displacement above or below the equinoctional position S due to declination is arrived at by multiplying the tangent of the angle of declination by d. The curve constructed from these displacement values is marked in months and provided with arrows showing the direction of motion. The director may be adjusted by a scale and pointer N for reading summer time. The position of the director pivot I on the disc may be varied. The equatorial plate A is adjustably connected to the fixed plate B by hinges C and telescopic arms D, graduations E being provided for different latitudes if desired. A lens may be fitted in the hole Q to give a brighter image, the focal length of the lens being the average distance Q to R. The director vane 0 may be curved and the diagram correspondingly modified.

Panoramic official-time sundials
FR2686166

The invention relates to sundial shapes allowing direct reading of the official time, from sunrise to sunset. These are dished hollow shapes bounded by a horizontal plane passing through the tip of the style. A great variety of possible shapes satisfy this condition. All the hour lines are 8s (meridians of mean time), the reading ambiguity of which is removed with a seasonal colour code; the change to summer time is provided for. They operate only at a given geographical location and may serve there as precision compass. The calculation and plotting of the hour lines, repeated for each shape and each location, can be done rapidly using "Computer Aided Draughting". The field for viewing the time is greatly increased when the walls are made from translucent material.

Pocket sundial
FR2645290

The invention reltes to a pocket sundial which does not need to be set prior to its use. It consists of a cylindrical ring obscured on one side by an integral or removable edging. The device is provided, at the top of its vertical axis, with a suspension eyelet 1. A slot 3 made in its periphery, perpendicularly to the edging, allows through the solar rays 6 which are projected in the form of a luminous line on a graduated vertical design 5.

Self-adjustable floating sundial
FR2634568

The invention relates to a sundial with automatic and instantaneous adjustment, also usable as compass. The apparatus consists of a float 1 which ensures the constant horizontality of a reference plane, of a permanent magnet 2 which constantly points the dial towards North and of a stylus 3 associated with a system of hour graduations mounted on the float. The applications relate to the production of sundials of all types (horizontal, vertical, equatorial etc.) and of compasses.

Apparatus making it possible to trace out the graduations of sundials
FR2604000

The invention relates to an apparatus making it possible to trace out, without calculations or geometrical constructions, the graduations of a sundial at any point on the Earth, whatever the orientation and geometrical nature of the chosen surface. It consists of a transparent drum 1 on which the two families of graduations 2 and 3 are painted, a point light source 4 and a stowage device 5 which enables the whole to be fixed to the end of the shaft of the future sundial. If this shaft has been correctly oriented (that is to say parallel to the axis of the Earth) by whatever method, the shadow of the graduations 2 and 3, which is projected onto the surface of the dial by the source 4, will construct the scales for reading the time which may be read off by any graphical method.

Equatorial cylindrical type universal sundial
FR2331826

The sundial has a meridian circle arc (2) onto which is fixed an equatorial circle arc (1) which carries time graduations. The sundial has a polar axis (3) parallel to the Earth axis. The progression of the shade of the polar axis (3) over the equatorial circle indicates the time. The meridian circle arc is preadjusted to the latitude of the place where it is installed and the equatorial circle arc is preadjusted to the longitude of the same place. The polar axis supports a terrestrial globe (5) whose position is set to give the correct positional relationship of the Earth to the Sun.

Sundial for fabrication and sale
FR2882598

The sundial has a plane (1) on which a concave mirror is fixed perpendicularly to allow reflected light radiation to a form a caustic with cusps (3). The cusps are displaced on the plane by following the movement of the sun so as to read the solar time at an intersection of clock lines and of a locus of cusps displacement. An inclining system inclines the plane based on a latitude of an observation place and the inclination of the sun.

Sundial has a translucid face...
FR2812732

Sundial has a translucid face (4) with a stylus (5) that throws its shadow onto the dial or face. Reversible figures (7) indicated the hours and can be read from either side of the face. The stylus is mounted on a centering piece and can be folded away.

Mobile sundial
DE102004038045

A mobile sundial shows accurate time and date directly for all colonisable planets has a dial (1) with two grids comprising straight horizontal and curved vertical lines covering a half year and pointer showing the time and data directly mounted on two connected rotating half tubes (b, c) to allow use at any point on earth with elastic cords (d) forming the pointer and holding the tubes to avoid play. Can be used with additions as a compass and is able to show a plane tilt without sun.

Mobile metal sundial...
DE20305905

A mobile metal sun dial comprises a dial (1) and a gnomon (2) stand pushed together using a slot and is light and small for mobile use.

Fibreoptic sundial
DE19703717

The sundial uses sunlight (1) passing through a perpendicular slit (6), which is positioned in the same position as the shadow throwing rod of a conventional sundial, so that it illuminates a sunlight sensitive fluorescing material (2), which has a geometry chosen so that the fluorescing part corresponds to the time. This is achieved by linking the fluorescing material (vertical rods) (2) to conducting fibre optic cable that in turn indicates the time on a clock face indicator (7).

Method to manufacture sundial; involves folding sundial in form of convex polyhedron
DE10002912

The method involves folding the sundial in the form of a convex polyhedron without additional elements. There is no gnomon. The convex polyhedron is foldable. A scale is marked on paper, cardboard, foil or another foldable material. Preferably, the polyhedron is a cube. An Independent claim is included for a sundial manufactured according to the method.

Fountain with horizontal sundial and globe
DE4420202

The invention makes it possible, by the combination of fountain, sundial and globe, even where very little space is available, to combine the benefits of the fountain with those of the sundial and, by the inclusion of the globe, which is driven by the fountain, to indicate the true rotation and illumination of the earth. The shadow-casting bar of the horizontal sundial, of which the scale is provided on the border of the basin of the fountain, is reinforced at the end directed towards the earth and is equipped with a rest for the globe. It serves as an axis of rotation for the globe, which rotates in true position with respect to the sun.; The fountain water makes contact with the grooves of a cone which is arranged, by means of two guide rings, rotatably on the shadow-casting bar and is fixedly connected to a water wheel, located in the equator plane of the globe and the perforated globe surface. The water is channelled into the chambers of the water wheel and causes the globe to rotate. The invention may be used in private plots of land and gardens and in public areas and facilities.

Sun dial clock with scale carrying surface and shadow thrower
DE4211527

The sundial clock includes a scale carrying surface (5), the progression of which is arranged in such a way, that the end point of the pointer shadow (4), travels at predetermined days of the year along a step edge (6a-6k) or/and a step neck. The progression of the scale carrying surface is arranged in such a way, that the end point of the pointer shadow, at predetermined days of the year, respectively for the same day time, skirts a step edge or/and a step neck. ADVANTAGE - Improved readability compared to known sun dials.

Combined clock and sun-dial...
DE2939822

The sundial which is also fitted with a clock drive, can be used to tell the time when there is no sun. The device has a rectangular base (1) with the drive unit (2) mounted at one end, and with a column extending upwards from it, carrying a curved frame (3). A spindle (5) connected to the drive unit at its lower end, slopes upwards and passes through the frame. The spindle carries an indicating ring (6) which travels around a segment of a ring (4) attached at right angles to the frame so as to project from it, at each side. The ring segment is marked in hours from one to twelve; the drive is a twenty-four hour drive.

Adjustment for vertical alignment of sundial - uses disc fitted pivotally onto face of sundial
DE2500642

The sundial has at least one approximately perpendicular face, provided with hour numerals along a given annular zone and a projecting element for casting a shadow onto the latter zone. The adjustment for vertical alignment of the sundial comprises a disc (7) defining a quarter segment of a circle, with a tongue (14) projecting at the centre of the circle and one at the bottom edge of the disc, these tongues fitting into corresponding holes in the face of the sundial in such manner as to allow the disc to pivot. The latter two holes lie on a line parallel to the centre line passing through the 12 o'clock marking on the sundial face.

SUNDIAL
WO0225381

The invention relates to a sundial having a screen (7) and an imaging device (4) projecting light (L) or shadow on the screen (7), wherein imaging takes place depending on the actual position of the sun. In order to provide a sundial that can be easily read and with the aid of which it is possible to display the actual local time, the average local time, the Central European time or any other standard time, the imaging device (4) has a reflecting device (4).

Sundial type machining apparatus for water distributing ring
CN101020256

The sundial type machining apparatus for water distributing ring includes a large borer, an outer water distributing ring turning plate, an inner water distributing ring turning plate, and a pedestal. The large borer is set on one side of the pedestal, the outer water distributing ring turning plate and the inner water distributing ring turning plate are fixed on the pedestal and separately on the outer water distributing ring turning plate and the inner water distributing ring turning plate, and these two water distributing ring turning plates are coaxial, parallel, able to be rotated separately and adjustable in the distance in between. The present invention has convenient flexible operation, and has small coaxiality error between the inner water distributing ring and the outer water distributing ring and small index error of the holes.

Multifunctional plane type sundial
CN101196728

The invention belongs to the field of a time measuring tool, in particular to multifunctional plane type sundial, which comprises a dial pin (1), a panel (2), a soleplate (3), an angle fixer (4) and a gemel (5). The utility model has simple structure and convenient operation; through the simple device, various functions of sundial can not only be simulated, but also the difficulty of lacking teaching aids of the kind is solved and good practicality is realized.

Multifunctional column type sundial
CN101196727

The invention belongs to the field of a time measuring tool, in particular to multifunctional column type sundial, which comprises a dial pin (1), a signature point (2), a dial tile (3), an angle fixer (4), a gemel (5) and a soleplate (6). The teaching aid of the invention has simple structure and convenient operation; through adjustment of the device, various sundial types can be simulated, the difficulty of lacking teaching aids of the kind is solved and good practicality is realized.

Sundial capable of inferring date
CN101196726

The invention belongs to the field of a time measuring tool, in particular to a sundial being able to measure date, which comprises a base (1), a rotary shaft (2), a dial (3), a transparent ball (4), a thin fiber (5), a small arc bracket (6) and a large arc bracket (7). The invention is practical and simple, has convenient operation, and confirms date through the calibration shown by the thin fiber according to different angles of the sun light irradiation.

Sundial made from long focus semicylindrical transparent lens
CN2724062

The utility model provides a sundial made from long focus semicylindrical transparent lens, capable of solving the problems that common sundials made from vertical bars can obtain vague sun shadow when the vertical bar is longer, and the sun shadow cannot be focalized on recording paper for recording; whereas the focal length of convex transparent lens or semicylindrical transparent lens made of glass cannot be longer than 2 meters due to the limitation of processing means. The utility model is characterized in that transparent organic glass is bent as an arc and fixed by adhesive, and purified water is filled to form a semicylindrical transparent lens with very long focal length. Under sunlight irradiation, a strip of long and thin light can be produced on a distant optical screen, so that a highly sensitive sundial can be obtained, and the sundial requires that the sun is positioned on the vertical line of the plane of the sundial. The methods are that two sets of strip shaped solar cells which are positioned on both sides of the focal length line can drive two motors, and the auto-tracking of the sundial can be realized by a driving mechanism.

U-shape horologe
CN2752822

The utility model relates to a U-shaped sundial. In ancient time, the intelligent working people in China can inspect the position of the sun by making a sundial. So, the utility model provides a U-shaped sundial. A U-shaped organic glass is served as a screen (1) of the sundial. A position dial disc (2)is equipped around the U-shaped organic glass screen (1). The U-shaped organic glass screen (1) is placed at the bottom of a l shaped support (3)according to the equator sundial. The angle of the surface of the support (3) and the earth surface is the local latitude. A glass tubular bottle (4)is also placed at the inner side of the U-shaped organic glass screen (1)at the bottom of the support (3). The glass tubular bottle (4)is filled with the purified water. The U-shaped sundial is provided with simple structure, easy use and can accurately display the orientation and the elevation angle of the sun.

Convex lens type spherical sundial
CN2724061


The utility model relates to a convex lens type spherical sundial. In ancient times, intelligent laboring people in China had already observed the position of the sun by making the sundial. Therefore, the utility model provides a convex lens type spherical sundial, comprising a hemispheric shell optical screen(1), a dome (2)covering on the hemispheric shell optical screen(1) and a convex glass cylinder(3) installed on the central part of the dome (2). Wherein, the radius of the hemispheric shell optical screen (1) is just equal to the focal distance of a convex glass; the convex glass cylinder(3) is connected with the dome (2) via a universal loop (4), which makes the axial center of the convex glass of the convex glass cylinder (3) pass through the circle center of a ball shape optical screen (1), and the focal distance of the convex glass is unchanged, and in addition, the convex glass cylinder(3) can rotate towards any direction. The convex lens type spherical sundial provided by the utility model is of simple structure and convenient use, and the azimuth and the altiude of the sun can be known according to meridians and parallels on the ball shape optical screen in the utility model.

Ultraviolet sundial
US5576551

A device for indicating the percentage of ultraviolet radiation which reaches the earth's surface for a given position of the Sun's altitude. The device consists of a planar member having a gnomon-like member affixed within its center. The gnomon-like member marks the center of nine (9) spaced concentric rings inscribed on a top surface of the planar member. The innermost circle is labeled 90%, the second 80% and so on to an outer edge. The radius for the circumference of each ring is calculated by a mathematical formula which correlates the altitude of the sun with a percentage amount of UV-B that reaches the surface of the earth.

Solar compass
DE3907328

This solar compass is used for exact determination of the celestial direction from the position of the sun at that time. Unlike magnetic compasses, it cannot be deflected from the correct reading by magnetic, electrical or other influences, by iron, steel or the like in its surroundings and has no pole-dependent declination. It consists of a simple disc with a 24-hour dial, on which a moving pointer is centrally fixed. If this pointer is set to the corresponding time of day and then pointed at the sun, the 24 mark of the dial (labelled N) will point exactly northwards at all times and at all locations. The simplicity of production and use will greatly encourage the popularity of this device. If this solar compass is set up pointing northwards, it can also be used as a sundial made in all possible sizes and of all possible materials. The pointer needs then only to be pointed at the sun and then simultaneously indicates the time of day on the dial.

Sun tracking positioning device base on sundial
CN202205097

The utility model discloses a sun tracking positioning device sundial based on a sundial, mainly comprising a digit signal processing apparatus, a data acquisition apparatus and a sundial which are successively connected; the sundial generates corresponding shadow on a sundial surface in dependence on the change of sun illumination positions; the data acquisition apparatus converts shadow information on the sundial surface into digit electric signals; the data signal processing apparatus processes input signals and restores the shadow information on the sundial surface; finally a sun horizontal azimuth and a height azimuth are calculated to obtain a position of the sun. The sun tracking positioning device can collect the information of a sun position in real time and obtain an accurate position of the sun, has the advantages of stability, reliability and a strong anti-interference capability and is suitable for most solar energy use equipment.

Cylindrical sundial with installation indicia
US4835875

A universal sundial which indicates watch time is constructed from a standard pipe section or cylinder with one end an elliptical plane at an angle to the axis of the cylinder preferably within approximately 15 DEG of the latitude of the proposed site. The gnomon is a small sphere located at the center of the elliptical plane end. Time, sun declination, latitude, and meridian displacement indicia are all located on the inner surface of the cylinder by angular coordinates from the center of the gnomon. Two cylinder or two removably attachable overlays are required for indication of civil time for a full year. The sundial is set up by orienting it so the shadow of the gnomon indicates the correct time when the gnomon is in a vertical position over the site latitude and meridian or meridian displacement indicia.

SUNDIAL USED AS INSTRUMENT FOR EDUCATION AND ASSEMBLING METHOD THEREOF
KR20040101626 / KR100517627

PURPOSE: A sundial for education materials and instruments and an assembling method thereof are provided to improve the learning efficiency by manufacturing the development figure of the sundial and directly assembling the semispherical paper sundial. CONSTITUTION: A sundial for an education instrument is composed of a hemispheric time bowl(10) hemi-spherically formed and composed of vertical time lines for indicating time and 13 horizontal season lines for displaying the 24 solar terms from the summer solstice to the winter solstice, an indicator(12) fastened to the zero point in the center of the hemispheric time bowl to form the shadow on the season line or the time line, and a supporting bar(18) fixing the hemispheric time bowl. An additional plate(14) is mounted to the back of the indicator, and two auxiliary supporting plates(16,17) are attached perpendicularly in the center of the back of the indicator to support the indicator.

Sundial From Which A Season Can Be Determined
KR100333770

PURPOSE: A sundial for checking season is provided to conveniently check the month, the 24 solar terms, the relative altitude of the sun, and the positions of constellations. CONSTITUTION: A round time plate(1) is marked with 24 scales. The round time plate rotates once a day. A round season plate(2) marked with many scales rotates 360.99 angular degrees a day in the direction the same as the time plate. A time reading line(4) is fixed individually to read specific time from the point intersecting with the time plate.

Adjustable sundial
GB2193351

Sundial consists of two semi circular arms 1, 4, fixed together at right angles and mounted by a cradle on a base. Adjustments for its location, for horizontal or vertical mounting and for use in either hemisphere are by movement of arm 1 aligning markings 3 against an arrow mark 11 on cradle 10. Arm 1 is reversible in cradle 10. Adjustments for longitude of location, for Equation of Time and for Summer Time are all made by markings 7 on strip 6 moving laterally against arrow marks 5 on arm 4.

Compact celestial navigation device
US7685722

A  celestial navigation device. A full-featured embodiment is useful as a sundial and planisphere and for measuring, among other things, latitude, longitude, and for time to angle conversions. The device may have one or more rings and is based on a transparent circular tube having a gravity indicator, typically a ball or bubble, in the circular tube, which locates the lowest or highest point in the tube to indicate time or angle measurements against a corresponding scale. The device may have a 24-hour time scale, a calendar scale, and/or an angle scale. One embodiment includes a split analemma with separate north and south portions. Each analemma portion is used with a corresponding gnomon of a pair of gnomons, each on opposite sides of the tubular ring. A two-ring embodiment has an inner ring and outer ring rotatably slidable relative to one another. Two additional gnomons and star position marks may be provided for star sighting observations. The device has a hollow center and may be worn as a bracelet and may be constructed with precious metals and/or gems to enhance the value of the bracelet aspect.

Holographic sundial
AT398008

The sundial consists of two reflection holograms 1, 2 which reconstruct a virtual scale 6 with indications of time of day and of season, as well as a virtual pointer 5 which in this case does not throw a shadow on the scale but functions as a kind of sight. The observer looks, as through an aiming device, along the hour pointer 5 which points to a given point on the scale. As the sun 3, as the reconstruction light source, travels on its course during the day, the pointer 5 will point in different directions at different times of the day. If the position of the sun and the behaviour of the holograms 1, 2 is calculated at different angles of incidence of the reconstruction light source, the direction in which the pointer 5 points, or the position of the scale 6, is known.; The direction of the pointer 5 must be intersected by the scale plane 6 in order to obtain the point of inscription for a given time of day or season.

Shadowless sundial
US4338727

A sundial is disclosed comprising specularly reflective convex surfaces that form virtual images of the sun in a separate plane or conical surface in which a numbered dial plate is mounted. The axis of revolution of the curved surfaces is mounted parallel to the axis of rotation of the earth and the time scale is also centered about this axis, but in a separate plane or cone located at a distance below the nearest reflective convex surface equal to the radius of said convex surface.

Improvements in sundials
GB450989

A portable combined sundial and compass com prises a light casing ( (of celluloid or casein housing a rotatable dia 1 of cardboard or other non-magnetic material marked with the compass points 7 and the usual shadow solar time mark ings 8 and having a sheet metal gnomon 2 mountec thereon, in combinatior with a compass magnei 3 which is displaced with relation to the markings to allow for the variation between True and Magnetic North. The dial and needle have a bearing cup 4 freely rotatable upon pin 5. The case may have a cover glass 9 and lid 10.

Sundial or light dial
FR2571516

This invention serves two alternative purposes, namely as a sundial recording the passage of the current time and as a light dial used in studying sunshine at various times and seasons in, for example, a three-dimensional model of a house construction project. The shadow of a small object 7, projected into a bowl 1 of a defined shape positioned in a defined manner, records the time of day and the date of the year with respect to a system of hour longitude lines and month latitude bands. A compound frame 2, 3, 4 retains the bowl 1 in a defined manner and enables it to rotate about an axis 10 and 11 to positions in which, with periodic rotational adjustment, the clock time and certain other time systems can be recorded.

Portable sundial teaching appearance
CN205068901

The utility model discloses a portable sundial teaching appearance, including base, sundial face, sundial needle and protractor, base below symmetry is equipped with 2 foot rests, the foot rest both ends respectively are equipped with 1 stabilizer blade, the stabilizer blade passes through the adjusting screw spiro union and is in on the foot rest, base upper surface center department is equipped with the compass, base upper surface level is equipped with 2 spirit levels to the symmetry, both ends respectively are equipped with a stand about the base top, are equipped with on one of them stand the protractor, the sundial face passes through screw movable mounting and is in between the stand, the activity cartridge has a pointer on the sundial face lateral wall, the perpendicular cartridge of sundial needle is in sundial face center, be carved with the heavenly stems, twelve earthly branches and time scale on the sundial face. The utility model discloses a portable sundial teaching appearance, simple structure, removal convenience can dynamicly be demonstrated, and the student of being convenient for understands and mr's teaching, and the practicality is strong.

SUNDIAL
JP2976099

PROBLEM TO BE SOLVED: To provide a sundial high in accuracy, common in any country on the earth and making the rising and setting positions of the sun and days of the four seasons recognizable like a season calendar in a narrow place by looking from the places of the winter solstice, the summer solstice and each object day of optional days. SOLUTION: A sundial machined into a cylinder 1 of 1m in length and 3cm in diameter is fitted being adjusted to the celestial pole. Supports 3 are provided in positions of 1m on a track right-angled to the cylinder from the place of the vernal- autumnal equinox 4 in the middle of the cylinder, at one-hour intervals so as to divide a circular arc 2 by 15 deg..; The supports 3 are fixed at intervals of 23.45 deg.=0.433775m to an upper winter solstice point 5 and a lower summer solstice point 6 from the vernal-autumnal equinox 4 in the middle of the cylinder. Among these supports, optional observation graduations 7 indexed by 91 days are vertically inscribed in regular order from the middle. The sun appears to move along the circular arc from the inscribed object day so as to become the sundial. This sundial is usable in any place on the earth without needing a large place. Even the rising and setting positions of the sun can be accurately recognized at the time of looking from the places of the winter solstice, summer solstice and an optional day.

Positioning sundial
TWI442199

A positioning sundial has an upper transparent hemisphere and a lower transparent hemisphere which are combined be the flanges at the edge portions thereof. A measure is installed between the upper hemisphere and a lower hemisphere. A retaiing ring is installed at a lower side of the lower hemisphere. A seat has four legs which are connected to the retaining ring. In use, the measure is adjusted that date for measuring. Then the orientation of the positioning sundial is adjusted manually so that the center of the measure is collinear with the sun. A dial pin at the center will project to the dial surface. The image directs to a time which represents the time when the measurement is performed. Moreover, by the present invention, the aspect of the location for measurement can be got.

KNOCKDOWN SUNDIAL MODEL AND THE ASSEMBLY METHOD
KR201000022169

PURPOSE: A prefabricated sundial model and an assembling method thereof are provided to enable a user to read the time by confirming a scale of a shadow using a zero-point part. CONSTITUTION: A prefabricated sundial model is composed of a dial(100), a gnomon(200), a visual display part(300), a support(400), and a support plate(500). A first fitting groove is formed in the dial. The gnomon comprises a second fitting groove and a third fitting groove. A zero-point part is formed in the bottom end of the gnomon. Multiple scales are formed on the outer surface of the visual display part. The support comprises a fastening hole and a bent part. A first fixing groove of the support plate is formed facing with the bent part.

FABRICATED MODEL SUNDIAL AND THE ASSEMBLY METHOD
KR100831171

A fabricated model sundial and an assembling method thereof are provided to allow a user to learn principles of a sundial such as the revolution and rotation of the earth by enabling the user to assemble a model of the sundial according to development figures. A fabricated model sundial is to be assembled by printing development figures including a dial plate(100), a gnomon(200), a dial plate rim(300), a prop(400) and a support(500) and by cutting the figures along dotted lines. The dial plate formed in a hemisphere shape includes season lines indicating 24 solar terms and hour lines indicating time. The gnomon is equipped with a rear end hook fixed to a fitting groove of the dial plate and a front end indication. The dial plate rim is provided on the upper edge of the dial plate. The prop is provided at the bottom of the dial plate to support the dial plate. The support is formed in a cross shape and maintains horizontality of the sundial.

SUNDIAL WITH ELEVATED GNOMON SUPPORT AVOIDING SHADOW ECLIPSE
US8533963

A hemispheric armillary with arms and supporting a structure for supporting a gnomon over a time indicating dial plate is constructed to avoid the arms' shadows from eclipsing the gnomon shadow on the dial plate.

Common method and system for three-dimensional simulation of sundial
CN103425850

The invention relates to a common method for three-dimensional simulation of a sundial. The method comprises the following steps that S10, the three-dimensional models of the surface and the pointer of the sundial are built; S11, the three-dimensional model of the sundial is built; S12, the solar altitude and the solar azimuth of a site at different moments are calculated; S13, the positions of the shadows of the pointer formed on the face at all the moments from sunrise to sunset are calculated, and the positions of all moment lines are obtained; S14, the motion track of a sundial shadow in any time frame from the sunrise to the sunset is dynamically simulated, and the simulation data from the sunrise to the sunset in one day or a year are output. The designed sundial is visually shown in a three-dimensional mode, the positions of the moment lines are visually simulated and analyzed, a visual and convenient simulation analysis and auxiliary demonstration tool is provided for sundial individualized design, city landscaping planning, science teaching and research and science popularization education, and the effect of sundial design and building is improved.

MANUFACTURING METHOD FOR SUNDIAL
JPS6324189

PURPOSE:To realize a sundial which can be installed in a wide area while giving a projection, a scale disk, and a scale exactly the same shape by varying only the inclination of a bottom surface in an installation direction parallel to a reference point. CONSTITUTION:The scale disk 1, projection plate 2, and scale 3 are formed on a base 4. The bottom surface 5 of the base 4 is formed having a slanting surface according to the installation place of the sundial. When the sundial constituted as shown above is installed at a target place, the upper part of the sundial is held parallel to the reference point and the correct time is displayed continuously.

Portable dismantle multi -functional sundial
CN204989780

The utility model discloses a portablely dismantle multi -functional sundial, the sundial of the different latitudes of specially adapted. This sundial characteristic comprises square box body and square lid. The left side of lid upper surface is arranged and is equipped with compass and spirit level, has the semicolumn recess to be used for placing the sundial on the lid, and the used horizontal nut of regulation level is equipped with in the lower surface four corners of lid. The bottom of box body is equipped with four buckles. The sundial needle has the screw thread, and corresponding latitude value is carved with in screw thread interrupt department. Have in the sundial dish centre bore with sundial needle assorted screw, sundial dish two sides is all scaled, the beneficial effects of the utility model are that a be fit for the ortable multi -functional field survivorship instrument that time and direction are judged to different latitudes is provided, also can regard as astronomical teaching aid, the preparation of available multiple material for the collection souvenir.

Scientific toy based on sundial theory
CN204485319

The utility model relates to the technical field of toys for children, in particular to scientific toy based on a sundial theory. The scientific toy comprises a chassis, a plurality of circular disks and a plurality of pasters, wherein the circular disks are fixed on the chassis by a pointer; the pasters are arranged corresponding to the circular disks and the pointer respectively; a compass is arranged on the chassis. By setting labels of the 24 solar terms on the circular disks and by setting labels of day time on the pasters, the scientific toy based on the sundial theory can guide children to know and understand Chinese traditional timing and solar terms culture; in addition, by allowing children to manually catch the projection of the pointer in the sun, the scientific toy can guide children to think about scientific principles.

Equator type sundial of can be adjusted freely and ground angle
CN206610092

The utility model provides an equator type sundial of can be adjusted freely and ground angle, including sundial body and sundial angle adjustment mechanism, the sundial body constitute by sundial dish and sundial needle, the sundial needle runs through perpendicularly in the sundial coils, its characterized in that: sundial dish two sides all is equipped with the time scale line, and the sundial body can be rotatory around sundial angle adjustment mechanism, and sundial angle adjustment mechanism is 90 degrees circular arc dishes, has set up the cambered way in the circular arc quotation, and the cambered way both sides are provided with skid -proof stripe, and the sundial body passes through fastener with the cambered way to be fixed, fastener including arc active blade and spring, spring one end connect the sundial body, the arc active blade is connected to one end.

ADJUSTABLE ARC SUNDIAL
AU6756081

Abstract not available

Sundial

US3099881

Abstract not available

Translucent sundial
US2049034

Abstract not available

Sundial
US2072565

Abstract not available

Ring sundial
US2033604

Abstract not available

Adjustable sundial
US3031763

Abstract not available

Sundial
US2488605

Abstract not available

WORLD SUNDIAL
KR850002185

Abstract not available

Slide-type sundial
DE3429750

No Abstract Available

Sundial and compass
US2594600

Abstract not available

Sundial
US1629238

Abstract not available

Portable sundial
US2094833

Abstract not available

Sundial
US2164532

Abstract not available

Sundial and nocturnal celestial timepiece
US2582179

Abstract not available

Sundial
US1651621

Abstract not available

WORLD SUNDIAL
KR850002185

Abstract not available

Sundial
US1670205

Abstract not available

Adjustable and movable sundial
US2637108

Abstract not available

Sundial watch
US2137519

Abstract not available

Equatorial precision sundial
US2207195

Abstract not available

Sundial
US1900117

Abstract not available

Sundial construction
US1875756

Abstract not available

Clock time sundial
US2192750

Abstract not available

Sundial
US1782114

Abstract not available

SYSTEM FOR CALCULATING THE DIRECTION OF SUN-LIGHT INCIDENCE AND METHOD THEREOF
KR20130022000

Abstract Not Available

SUNDIAL
JP5723689

Abstract Not Available

STANDARD TIME SUNDIAL
US3616538
 

Abstract not available

Portable equatorial sundial
US2963790

Abstract not available

SUNDIAL
CA233083

Abstract not available

PORTABLE SUNDIAL
HU4645

Abstract Not Available

TRACKING SUNDIAL
AU608739

Abstract not available

Portable sundial device
TWM405587

Abstract Not Available

Universal sundial
US3417473

Abstract not available

Sundial
US1811183

Abstract not available

Sundial
US1396937
 

Abstract not available

US1496403
Sundial

Abstract not available

Sundial
US1520790
 

Abstract not available

Sundial
US2846768

Abstract not available

Portable sundial
US2463781

Abstract not available

Sundial
US1496403


Abstract not available

Adjustable sundial
US3205581

Abstract not available

Sundial with standard time display
US7114262
A horizontal sundial ( 1 ) that can be used to find standard time accurately and be manufactured on a commercial basis for any specific location, incorporating a gnomonic projection map ( 1 M), a wire gnomon ( 1 a) to indicate the time on a scale ( 1 b), and the point of noon on the map ( 1 c), and a bead ( 1 d) located directly above the center of the dial for indicating the Sun's overhead position on the map ( 1 e), and marking special occasions and special dates

US8091245
SUNDIAL

Various embodiments of the sundial disclosed herein may be used to determine the time of day based on the position of the sun. The sundial may comprise an at least substantially spherical curved reflector that may be at least partially transparent and at least partially reflective such that light from the sun can pass through a surface of the reflector and be reflected off of an internal surface of the reflector to reflect an image of the sun from the internal surface. The sundial may further comprise a dial face for viewing of a reflected image of the sun to provide at least an approximate indication of the time based on the position of the reflected image of the sun on the dial face.

SUNDIAL WITH ELEVATED GNOMON SUPPORT AVOIDING SHADOW ECLIPSE
US8533963
A hemispheric armillary with arms and supporting a structure for supporting a gnomon over a time indicating dial plate is constructed to avoid the arms' shadows from eclipsing the gnomon shadow on the dial plate.

SUNDIAL
US8091245

Embodiments of a sundial. Various embodiments of the sundial disclosed herein may be used to determine the time of day based on the position of the sun. The sundial may comprise an at least substantially spherical curved reflector that may be at least partially transparent and at least partially reflective such that light from the sun can pass through a surface of the reflector and be reflected off of an internal surface of the reflector to reflect an image of the sun from the internal surface. The sundial may further comprise a dial face for viewing of a reflected image of the sun to provide at least an approximate indication of the time based on the position of the reflected image of the sun on the dial face.

An instrument for finding latitude and local time
GB456003
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A horizontal plate graduated after the manner of a sundial has a style which is angularly adjustable by means of a knob and gearing. The altitude of the style is indicated on a scale. The instrument is intended for the determination of latitude and local time.

Improvements in Sundials

GB191011393
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The inside of the hemisphere of the sundial described in the parent Specification, or of a hemisphere supporting a sunshine-recorder, is lined with a map of the terrestial hemisphere so that the instrument can be adjusted for any place by a central plumbline.





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