Equatorial sundial

Abstract

The utility model provides an equatorial sundial. The equatorial sundial comprises a latitude plate, a sundial surface fixing plate, a sundial disc and a time difference speed checking ruler, the sundial surface fixing plate is formed by folding a sundial surface fixing plate front surface and a sundial surface fixing plate back surface, geographic longitude scales are arranged on the sundial surface fixing plate front surface, and the sundial surface fixing plate is fixed on one side edge of each of the two latitude plates; the sundial disc is clamped between the sundial surface fixing plate front side and the sundial surface fixing plate back side of the sundial surface fixing plate, a sundial needle is arranged in the center of the sundial disc, time scales are arranged on the front side and the back side of the sundial disc, and the front side of the sundial disc is further provided with a geographic longitude alignment line, date scales and a true ordinary time difference graph corresponding to the date scales. The geographical longitude alignment line is aligned with the geographical longitude of the corresponding observation place on the geographical longitude scale; one end of the time difference speed checking ruler is provided with a first positioning hole which can be positioned on the sundial needle, and the time difference speed checking ruler is provided with time difference scales. The time difference measuring device can be widely applied to different places, and is convenient to measure time difference and convenient to manufacture.

Description

Technical Field

[0001] The utility model relates to the technical field of sundials, in particular to an equatorial sundial. Background Art

[0002] A sundial, or solar clock, is a device that specifies the hour or minute based on the position of the sun's shadow.

[0003] The equatorial sundial is the most classic and traditional astronomical observation instrument in ancient China. It is usually composed of a base, a pointer and a disk. The pointer is called a "dial style", the upper end of which points to the north celestial pole and the lower end points to the south celestial pole. The angle between the installation angle of the gnomon and the ground (horizontal plane) is the local geographical latitude. The disk is called a "dial face", which is parallel to the celestial equatorial plane. The inclination angle between the dial face and the ground plane (horizontal plane) = 90°-Φ (Φ is the local geographical latitude). Its main feature is that the time scale on the dial is equally divided.

[0004] The way the time is displayed on the equatorial sundial is similar to that of a modern clock. The time scale on the dial is evenly spaced, and the time can be read directly by looking at the direction of the shadow of the gnomon. However, the time displayed is the sundial time, which is the true solar time of the place where the sundial is installed, not the time we use in our daily lives.

[0005] The time we use now is "Beijing time", which is the mean solar time at 120 degrees east longitude. There are two values ​​that need to be converted between sundial time and Beijing time: "longitude time difference" and "true mean solar time difference".

[0006] At present, there are many kinds of teaching materials about equatorial sundials in China, most of which are devices that adjust the latitude to adapt to the local geographical latitude. "Longitude time difference" and "true mean solar time difference" need teaching materials or explanations to explain clearly. Utility Model Content

[0007] In view of the defects in the prior art, the utility model provides an equatorial sundial which can be widely used in different locations, is convenient for measuring time differences and is easy to manufacture.

[0008] On the one hand, the utility model provides an equatorial sundial, comprising:

[0009] Latitude plate, the latitude plate has two sides, the angle between the two sides = 90°-the geographical latitude of the observation site, and two latitude plates are arranged opposite to each other on the left and right;

[0010] A dial plate, wherein the dial plate is formed by folding the front side of the dial plate and the back side of the dial plate, and the front side of the dial plate and the back side of the dial plate away from the folding line are both provided with concave arc edges, and the front side of the dial plate is provided with geographic longitude scales along the arc edges. The dial plate is fixed on one side of the two latitude plates, and the concave arc edge of the dial plate faces obliquely upwards;

[0011] A sundial, the sundial being clamped between the front and back sides of the dial-face fixing plate of the dial-face fixing plate, the sundial being concentric with the center of the inner concave arc edge, a gnomon pendulum penetrating both sides being arranged at the center of the sundial, time scales being arranged on the front and back sides of the sundial, a geographic longitude alignment line, a date scale and a true mean time difference diagram corresponding to the date scale being arranged on the front side of the sundial, the geographic longitude alignment line being aligned with the geographic longitude of the observation site corresponding to the geographic longitude scale;

[0012] A time difference quick-checking ruler, one end of which is provided with a first positioning hole capable of being positioned on a sundial, and the time difference quick-checking ruler is provided with a time difference scale extending from the first positioning hole toward the far end.

[0013] Furthermore, the latitude plate is made of a right-angled sector plate, on which a geographic latitude scale is provided, and the central angle of the latitude plate actually required to be used is cut according to the geographic latitude of the observation site.

[0014] Furthermore, it also includes a positioning lining, which is clamped between the front side and the back side of the dial face fixing plate of the dial face fixing plate, and one side edge of the positioning lining is provided with a positioning arc edge that matches the arc edge of the sundial plate.

[0015] Furthermore, a first clamping protrusion is provided on one side edge of the latitude plate, and first clamping grooves are provided on the front side of the dial fixing plate, the back side of the dial fixing plate and both ends of the positioning lining. The first clamping grooves on the front side of the dial fixing plate, the back side of the dial fixing plate and the positioning lining are aligned and overlapped respectively, and each of the first clamping protrusions is respectively clamped into a correspondingly overlapping first clamping groove on the front side of the dial fixing plate, the back side of the dial fixing plate and the positioning lining.

[0016] Furthermore, the latitude plate is provided with a first bayonet, and the first bayonet extends out from a side close to a side of a low-latitude geographic latitude scale;

[0017] It also includes a latitude support plate, and a second snap-in is provided on one side of the latitude support plate close to both ends. The second snap-in at both ends of the latitude support plate respectively corresponds to the first snap-in on the two latitude plates and snaps in mutual connection.

[0018] Furthermore, the latitude support plate is provided with strip grooves near both ends, and the latitude support plate is folded along the center line so that the strip grooves at both ends of the latitude support plate form a second clamping groove on one side of the latitude support plate.

[0019] Furthermore, the gnomon passes through the center of the sundial plate, and the gnomon is provided with a front fixing plate positioned on the front of the sundial plate and a rear fixing plate positioned on the back of the sundial plate.

[0020] Furthermore, it also includes a solar term scale, which includes a solar term scale positioning plate and a solar term scale scale plate, the solar term scale positioning plate and the solar term scale scale plate form a vertical L-shaped structure, the solar term scale positioning plate is provided with a second positioning hole capable of being positioned on the sundial at one end away from the solar term scale scale plate, and the solar term scale plate is provided with a solar term scale on one side close to the solar term scale positioning plate.

[0021] Furthermore, the solar term scale also includes two solar term scale support plates, the solar term scale support plates have two vertical side edges, and second clamping protrusions are provided on the two vertical side edges of the solar term scale support plates. Second clamping grooves are provided on both sides of the solar term scale positioning plate and the solar term scale scale plate, and the second clamping protrusions on both sides of each of the solar term scale support plates are respectively clamped with the second clamping grooves on the solar term scale positioning plate and the solar term scale scale plate in a one-to-one correspondence.

[0022] The beneficial effects of the utility model are embodied in:

[0023] 1. When using a sundial, the sundial can be rotated to align the geographic longitude alignment line on the sundial with the geographic longitude of the observation site corresponding to the geographic longitude scale on the dial fixed plate, so that the sundial can be corrected according to the geographic longitude of the observation site to achieve the purpose of correcting the longitude time difference. At the same time, the time difference value can be quickly checked on the sundial with a time difference speed check ruler. The method of checking is: the first positioning hole on the time difference speed check ruler is positioned on the sundial needle, and then the time difference speed check ruler is rotated so that the time difference speed check ruler is aligned with the corresponding observation date on the date scale, and then the reading at the intersection of the time difference speed check ruler and the true mean time difference diagram is read, which is the time difference value. The sundial time can be directly read by the time scale indicated by the shadow of the sundial needle on the sundial, and then Beijing time = sundial time + time difference value can be calculated. Therefore, the present application can be widely used in different locations, which is convenient for measuring time difference and for quickly converting sundial time into Beijing time.

[0024] 2. The parts required for the equatorial sundial are integrated on the cardboard by die-stamping. All parts can be removed from the cardboard by simple cutting and then assembled according to the design. The sundial needle can be used as a toothpick. It has a simple structure and can be assembled by users themselves, making it easy to make. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 This is a schematic diagram of a paperboard in Example 1 of the utility model;

[0027] Figure 2 A schematic diagram of another paperboard of the utility model embodiment;

[0028] Figure 3 It is a cutting schematic diagram of the latitude plate of the embodiment of the utility model;

[0029] Figure 4 A schematic diagram of assembling the positioning liner and the dial fixing plate according to an embodiment of the utility model;

[0030] Figure 5 It is a front view of the assembly of the positioning liner and the dial fixing plate of the embodiment of the utility model;

[0031] Figure 6 It is a schematic diagram of the assembly of the sundial fixing plate and the latitude plate according to an embodiment of the utility model;

[0032] Figure 7 It is a front view of the assembly of the sundial plate and the dial face fixing plate according to the embodiment of the utility model;

[0033] Figure 8 A schematic diagram of reading the time difference value according to an embodiment of the utility model;

[0034] Fig. 9 This is a partial enlarged diagram of reading the time difference value in the embodiment of the utility model;

[0035] Fig.10 This is a schematic diagram of the structure of the solar term scale of the utility model embodiment;

[0036] Fig.11 This is a schematic diagram of the assembly of the solar term scale and the sundial plate according to the embodiment of the utility model;

[0037] Fig.12 This is a schematic diagram of reading solar terms according to an embodiment of the utility model.

[0038] In the attached drawings, 100-latitude plate; 110-geographic latitude scale; 120-first clamping protrusion; 130-first clamping port; 200-dial plate; 210-front of dial plate; 220-back of dial plate; 230-inner concave arc edge; 240-geographic longitude scale; 250-first clamping slot; 300-sundial plate; 310-dial style; 311-front fixing plate; 312-rear fixing plate; 320-time scale; 330-geographic longitude alignment line; 340- Date scale; 350-true time difference diagram; 400-time difference quick-check ruler; 410-first positioning hole; 420-time difference scale; 500-positioning lining; 510-positioning arc edge; 600-latitude support plate; 610-strip groove; 700-solar term scale; 710-solar term scale positioning plate; 711-second positioning hole; 720-solar term scale plate; 721-solar term scale; 730-solar term scale support plate; 731-second snap-in protrusion; 732-second snap-in slot. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0040] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0041] The utility model embodiment provides an equatorial sundial, such as Figure 1 and Figure 2 As shown, the parts required for the equatorial sundial are integrated on the cardboard by die-stamping.

[0042] Reference Figure 3-Figure 9 The equatorial sundial includes a latitude plate 100, a dial surface fixing plate 200, a sundial plate 300 and a time difference quick-checking ruler 400.

[0043] The latitude plate 100 has two sides, and the angle between the two sides = 90°-the geographical latitude of the observation location. Two latitude plates 100 are arranged opposite to each other on the left and right.

[0044] Reference Figure 3 The latitude plate 100 is made of a right-angled sector plate, on which a geographic latitude scale 110 is provided. The center angle of the latitude plate 100 actually required to be used is cut according to the geographic latitude of the observation site. For example: if the geographic latitude of the observation site is 30 degrees, then refer to Figure 3 , use the angle values ​​of the right-angle tip and the inner and outer rings as reference, draw lines with the help of a ruler and then cut with a knife or scissors. The value cut off from the two latitude boards at 100 should be the local geographical latitude value.

[0045] The latitude plate 100 is provided with a first bayonet 130, and the first bayonet 130 extends from a side close to the low-latitude geographic latitude scale 110. Figure 1 This embodiment further includes a latitude support plate 600, and a second bayonet is provided on one side of the latitude support plate 600 near both ends. Specifically, a strip groove 610 is provided near both ends of the latitude support plate 600, and the latitude support plate 600 is folded along the center line, so that the strip grooves 610 at both ends of the latitude support plate 600 form a second bayonet on one side of the latitude support plate 600. The second bayonet at both ends of the latitude support plate 600 corresponds to the first bayonet 130 on the two latitude plates 100 and is engaged with each other, so that the two latitude plates 100 can be fixed and positioned by the latitude support plate 600.

[0046] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6 The dial plate 200 is formed by folding the front side 210 and the back side 220 of the dial plate. The front side 210 and the back side 220 of the dial plate are both provided with a concave arc edge 230 away from the folding line. The front side 210 of the dial plate is provided with a geographic longitude scale 240 along the arc edge. The dial plate 200 is fixed on one side of the two latitude plates 100, and the concave arc edge 230 of the dial plate 200 faces obliquely upward.

[0047] Reference Figure 2 and Figure 7 The sundial plate 300 is stuck between the front side 210 and the back side 220 of the dial plate fixing plate 200. The sundial plate 300 is concentric with the center of the inner concave arc edge 230. The center of the sundial plate 300 is provided with a dial needle 310 running through both sides. The front and back sides of the sundial plate 300 are provided with time scales 320. The front side of the sundial plate 300 is also provided with a geographic longitude alignment line 330, a date scale 340 and a true mean time difference diagram 350 corresponding to the date scale 340. The geographic longitude alignment line 330 is aligned with the geographic longitude of the observation site corresponding to the geographic longitude scale 240.

[0048] In order to position the installation of the sundial plate 300, the present embodiment further includes a positioning liner 500, which is sandwiched between the front side 210 and the back side 220 of the dial face fixing plate 200. One side of the positioning liner 500 is provided with a positioning arc edge 510 adapted to the arc edge of the sundial plate 300. In this way, when the sundial plate 300 is inserted between the front side 210 and the back side 220 of the dial face fixing plate 200, it can be positioned by the positioning liner 500, which helps to improve the installation accuracy of the sundial plate 300.

[0049] Preferably, a first clamping protrusion 120 is provided on one side of the latitude plate 100, and first clamping grooves 250 are provided on both ends of the dial face fixing plate front 210, the dial face fixing plate back 220 and the positioning lining 500. The first clamping grooves 250 on the dial face fixing plate front 210, the dial face fixing plate back 220 and the positioning lining 500 are respectively aligned and overlapped, and each first clamping protrusion 120 is respectively clamped into a correspondingly overlapping first clamping groove 250 on the dial face fixing plate front 210, the dial face fixing plate back 220 and the positioning lining 500. In this way, after the first clamping protrusion 120 is clamped into the first clamping groove 250, it can be fixed to the dial face fixing plate front 210, the dial face fixing plate back 220 and the positioning lining 500 at the same time, which is not only convenient for assembly, but also can position and install the positioning lining 500, thereby ensuring the installation accuracy of the sundial plate 300.

[0050] The gnomon 310 can be made of a disposable toothpick, which is convenient for material collection. In order to ensure that the gnomon 310 is vertically fixed at the center of the dial surface, the gnomon 310 passes through the center of the sundial plate 300. The gnomon 310 is provided with a front fixing plate 311 positioned on the front side of the sundial plate 300 and a rear fixing plate 312 positioned on the back side of the sundial plate 300.

[0051] Reference Figure 1 and Figure 8 A first positioning hole 410 capable of being positioned on the sundial 310 is provided at one end of the time difference quick-checking ruler 400, and a time difference scale 420 extending from the first positioning hole 410 toward the far end is provided on the time difference quick-checking ruler 400.

[0052] When using the sundial, the sundial plate 300 can be rotated to align the geographic longitude alignment line 330 on the sundial plate 300 with the geographic longitude of the observation location corresponding to the geographic longitude scale 240 on the dial fixing plate 200, so that the sundial plate 300 can be corrected according to the geographic longitude of the observation location to achieve the purpose of correcting the longitude time difference. At the same time, the time difference speed check ruler 400 can also be used to quickly check the time difference value on the sundial plate 300. The checking method is: the first positioning hole 410 on the time difference speed check ruler 400 is positioned on the sundial style 310, and then the time difference speed check ruler 400 is rotated to align the time difference speed check ruler 400 with the corresponding observation date on the date scale 340, and then the reading at the intersection of the time difference speed check ruler 400 and the true mean time difference value diagram 350 is read, which is the time difference value.

[0053] For example: Fig. 9 As shown, if the observation date is July 10, the positioning hole on the time difference speed check ruler 400 is positioned on the sundial 310, and the time difference speed check ruler 400 is rotated to align the pointer with the date of July 10, and the intersection of the true time difference value diagram 350 on the dial and the time difference speed check ruler 400 is observed, and the time difference value is found to be between 5.6 and 5.8.

[0054] The sundial time can be directly read from the time scale 320 indicated by the shadow of the sundial style 310 on the sundial plate 300, and then the Beijing time = sundial time + time difference value can be calculated.

[0055] Therefore, the present application can be widely applicable in different locations, is convenient for measuring time differences, and is convenient for quickly converting sundial time into Beijing time.

[0056] like Figure 2 , Fig.10 , Fig.11 and Fig.12 As shown, this embodiment further includes a solar term scale 700 and two solar term scale support plates 730 .

[0057] The solar term scale 700 includes a solar term scale positioning plate 710 and a solar term scale scale plate 720, which form a vertical L-shaped structure. The solar term scale positioning plate 710 is provided with a second positioning hole 711 that can be positioned on the sundial 310 at one end away from the solar term scale scale plate 720, and the solar term scale plate 720 is provided with a solar term scale 721 on one side close to the solar term scale positioning plate 710.

[0058] The solar term scale support plate 730 has two vertical sides, and second clamping protrusions 731 are provided on the two vertical sides of the solar term scale support plate 730. Second clamping grooves 732 are provided on both sides of the solar term scale positioning plate 710 and the solar term scale scale plate 720. The second clamping protrusions 731 on both sides of each solar term scale support plate 730 are respectively clamped with the second clamping grooves 732 on the solar term scale positioning plate 710 and the solar term scale scale plate 720 in a one-to-one correspondence.

[0059] How to use the solar term scale 700: Figure 2 Remove the solar term scale main board and the solar term scale support plate 730, first fold the solar term scale main board along the dotted line into a right angle, and then snap the second snap-in protrusions 731 on both sides of the solar term scale support plate 730 into the second snap-in grooves 732 on the solar term scale positioning plate 710 and the solar term scale scale plate 720 (as shown in FIG. Fig.10 When measuring the solar term, position the second positioning hole 711 on the solar term scale positioning plate 710 on the sundial 310, confirm that the distance from the sundial tip to the solar term scale positioning plate 710 is equal to 30 mm, rotate the solar term scale 700 to the position indicated by the shadow of the sundial 310, and the shadow of the sundial 310 on the solar term scale 700 indicates the solar term interval of the day, as shown below Fig.12 As shown, the shadow of the tip of the sundial 310 falls on the Qingming and Bailu lines. If the day is in the first half of the year, the day is near the "Qingming" solar term. If the day is in the second half of the year, the day is near the "Bailu" solar term.

[0060] The present invention also provides a method for making an equatorial sundial, comprising the following steps:

[0061] Step S10, removing two rectangular sector-shaped latitude plates 100 marked with geographic latitude scales 110 from the printed paperboard, cutting the latitude plates 100 according to the geographic latitude of the observation site, and the value of the geographic latitude scales 110 cut off from the latitude plates 100 is the geographic latitude of the observation site;

[0062] Step S20, the dial plate fixing plate front 210, the dial plate fixing plate back 220 and the positioning lining 500 of the dial plate fixing plate 200 are removed from the printed paperboard, the dial plate fixing plate front 210 and the dial plate fixing plate back 220 are folded in half along the middle dotted line, and the positioning lining 500 is installed between the folded dial plate fixing plate front 210 and the dial plate fixing plate back 220;

[0063] Step S30, assembling the two cut latitude plates 100 on the back sides of both ends of the dial fixing plate 200 respectively;

[0064] Step S40, removing the sundial plate 300 printed with the front and back patterns from the printed paperboard, and folding the front and back of the sundial plate 300 in half;

[0065] Step S50, passing the gnomon 310 through the center of the sundial plate 300, and respectively passing the two ends of the gnomon 310 through the front fixing plate 311 and the rear fixing plate 312 to fix them on both sides of the sundial plate 300;

[0066] Step S60, insert the sundial plate 300 between the front side 210 and the back side 220 of the dial face fixing plate, and rotate the sundial plate 300 so that the geographic longitude alignment line 330 on the sundial plate 300 is aligned with the geographic longitude of the observation site corresponding to the geographic longitude scale 240.

[0067] The parts required for the equatorial sundial are integrated on the cardboard by die-stamping. All parts can be removed from the cardboard by simple cutting and then assembled according to the design. The sundial needle 310 can be used as a toothpick. It has a simple structure and can be assembled by users themselves, which is convenient to manufacture.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An equatorial sundial, characterized in that: include: Latitude plate, the latitude plate has two sides, the angle between the two sides = 90°-the geographical latitude of the observation site, and two latitude plates are arranged opposite to each other on the left and right; A dial plate, wherein the dial plate is formed by folding the front side of the dial plate and the back side of the dial plate, and the front side of the dial plate and the back side of the dial plate away from the folding line are both provided with concave arc edges, and the front side of the dial plate is provided with geographic longitude scales along the arc edges, and the dial plate is fixed on one side of the two latitude plates, and the concave arc edge of the dial plate faces obliquely upward; A sundial, the sundial being clamped between the front and back sides of the dial-face fixing plate of the dial-face fixing plate, the sundial being concentric with the center of the inner concave arc edge, a gnomon pendant penetrating both sides being arranged at the center of the sundial, time scales being arranged on the front and back sides of the sundial, a geographic longitude alignment line, a date scale and a true mean time difference diagram corresponding to the date scale being arranged on the front side of the sundial, the geographic longitude alignment line being aligned with the geographic longitude of the observation site corresponding to the geographic longitude scale; A time difference quick-checking ruler, one end of which is provided with a first positioning hole capable of being positioned on a sundial, and the time difference quick-checking ruler is provided with a time difference scale extending from the first positioning hole toward the far end.

2. The equatorial sundial according to claim 1, characterized in that: The latitude plate is made of a right-angled sector plate, on which a geographic latitude scale is arranged. The central angle of the latitude plate actually required to be used is cut according to the geographic latitude of the observation site.

3. The equatorial sundial according to claim 1, characterized in that: It also includes a positioning liner, which is clamped between the front side and the back side of the dial face fixing plate of the dial face fixing plate, and one side edge of the positioning liner is provided with a positioning arc edge that matches the arc edge of the sundial plate.

4. The equatorial sundial according to claim 3, characterized in that: A first clamping protrusion is provided on one side edge of the latitude plate, and first clamping grooves are provided on the front side of the dial face fixing plate, the back side of the dial face fixing plate and both ends of the positioning lining. The first clamping grooves on the front side of the dial face fixing plate, the back side of the dial face fixing plate and the positioning lining are aligned and overlapped respectively, and each of the first clamping protrusions is respectively clamped into a correspondingly overlapping first clamping groove on the front side of the dial face fixing plate, the back side of the dial face fixing plate and the positioning lining.

5. The equatorial sundial according to claim 1, characterized in that: The latitude plate is provided with a first bayonet, and the first bayonet extends from a side close to a low-latitude geographic latitude scale; It also includes a latitude support plate, and a second snap-in is provided on one side of the latitude support plate close to both ends. The second snap-in at both ends of the latitude support plate respectively corresponds to the first snap-in on the two latitude plates and snaps in with each other.

6. The equatorial sundial according to claim 5, characterized in that: The latitude support plate is provided with strip grooves near both ends, and the latitude support plate is folded along the center line so that the strip grooves at both ends of the latitude support plate form a second clamping groove on one side of the latitude support plate.

7. The equatorial sundial according to claim 1, characterized in that: The gnomon passes through the center of the sundial disk, and a front fixing plate positioned on the front of the sundial disk and a rear fixing plate positioned on the back of the sundial disk are passed through the gnomon.

8. The equatorial sundial according to claim 1, characterized in that: It also includes a solar term scale, which includes a solar term scale positioning plate and a solar term scale scale plate, the solar term scale positioning plate and the solar term scale scale plate form a vertical L-shaped structure, a second positioning hole capable of being positioned on a sundial is provided at one end of the solar term scale positioning plate away from the solar term scale scale plate, and a solar term scale is provided on one side of the solar term scale scale plate close to the solar term scale positioning plate.

9. The equatorial sundial according to claim 8, characterized in that: The solar term scale also includes two solar term scale support plates, which have two vertical side edges. Second clamping protrusions are provided on the two vertical side edges of the solar term scale support plates. Second clamping grooves are provided on both sides of the solar term scale positioning plate and the solar term scale scale plate. The second clamping protrusions on both sides of the solar term scale support plates correspond one-to-one to the second clamping grooves on the solar term scale positioning plate and the solar term scale scale plate.

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