Sunrise and sunset calculation look-up table

Abstract

The utility model discloses a sunrise and sunset calculation lookup table which comprises an identification mainboard and a vernier which are matched with each other, the identification mainboard is of a thin plate structure with a time difference indicating gauge arranged on the surface, and damping adhesive tapes are adhered to the upper end and the lower end of the identification mainboard; the vernier is of a transparent scale structure with an indicating marked line and scales on the surface, the upper end and the lower end of the vernier extend inwards to form sliding parts respectively, the vernier is connected with the identification main board in a sliding mode through the sliding parts, the vernier slides in the X-axis direction of the identification main board through the sliding parts and indicates the scales, and the sliding parts abut against the damping rubber strip when moving. The damping rubber strip is mainly used for reducing the friction force between the vernier and the identification main board, so that the vernier can slide more stably and smoothly. According to the sunrise and sunset calculation lookup table provided by the utility model, through a physical structure and simple and visual scales, a user can quickly find sunrise and sunset moments at any place and at any date.

Description

Technical Field

[0001] This utility model relates to the field of basic celestial information query, specifically a sunrise and sunset calculation query table. Background Technology

[0002] Humans have long mastered precise methods for calculating the laws governing celestial motion, especially after the advent of electronic computers, which allow astronomers to calculate the trajectories and timing of celestial bodies down to the millisecond level. Thanks to powerful computing capabilities, astronomical research and celestial observation have made tremendous progress, enabling accurate predictions of various celestial events, including sunrise and sunset, stellar motion, and astronomical phenomena.

[0003] However, astronomical knowledge remains relatively unfamiliar to most ordinary people, especially the calculations of astronomical phenomena such as sunrise and sunset. Ordinary users often struggle to grasp the complex calculation methods and lack convenient, intuitive tools to help understand and access relevant data. Sunrise and sunset times are not only closely related to astronomy but are also indispensable elements in everyone's daily life, affecting people's schedules, work arrangements, and time management in fields such as agriculture. The significant differences in sunrise and sunset times across different locations and seasons are a source of frequent curiosity and confusion.

[0004] In addition to sunrise and sunset, many people are interested in the longest and shortest days of the year, especially the length of daylight on specific dates (such as the spring equinox, summer solstice, autumn equinox, and winter solstice). Although astronomical calculations are quite precise, public understanding of this knowledge remains limited, and traditional calculation methods are still too complex for ordinary people to easily determine the exact times of sunrise and sunset and the variations in daylight hours.

[0005] Currently, while some mobile applications and weather forecasts can provide sunrise and sunset times for the current day, these tools are generally limited to that day's queries and mostly lack flexibility, failing to provide users with sunrise and sunset information across dates and locations. Therefore, the market lacks a simple and convenient device that allows users to find sunrise and sunset times for any location and any date, while also providing relatively accurate sunshine information. Utility Model Content

[0006] The purpose of this invention is to provide a sunrise and sunset calculation lookup table, which, through its physical structure and simple, intuitive scale, enables users to quickly find the sunrise and sunset times for any location and any date.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a sunrise and sunset calculation lookup table, including a matching main board and a cursor, wherein:

[0008] The mainboard is a thin plate structure with a time difference indicator on its surface, and damping rubber strips are attached to the upper and lower ends of the mainboard.

[0009] The vernier is a transparent ruler structure with indicator lines and scale on its surface. The upper and lower ends of the vernier extend inward to form sliding parts, and the vernier is slidably connected to the main indicator board through the sliding parts.

[0010] Preferably, the vernier slides along the X-axis of the main indicator plate via a sliding part to indicate the scale. The sliding part contacts a damping rubber strip during movement. The main function of the damping rubber strip is to reduce the friction between the vernier and the main indicator plate, making the vernier slide more smoothly and steadily. By providing moderate resistance during sliding, it prevents the vernier from moving too quickly or too abruptly, thereby ensuring that the vernier can stably stop at the desired scale position, improving the accuracy and stability of the query.

[0011] Preferably, the time zone indicator, indicator lines, and scale on the main board and cursor are printed or molded. Compared to other manual marking methods, printing or molding the time zone indicator effectively prevents the marks from fading, blurring, or falling off during long-term use. Printing and molding techniques can use wear-resistant, light-resistant, and corrosion-resistant materials to ensure the time zone indicator remains clearly visible even after long-term use, guaranteeing the accuracy of the query. During the sliding process, the cursor should remain at the 0 mark, coinciding with the date line below the main board, and the cursor's indicator lines should remain perpendicular to the sliding direction.

[0012] Preferably, the time difference indicator includes a date indicator axis arranged along the X-axis on the lower side of the main board, a longitude and time indicator axis arranged along the X-axis on the upper side of the main board, and an indicator curve located between the date indicator axis and the longitude and time indicator axis.

[0013] Preferably, the indicator curves include time difference curves and latitude correlation lines.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The sunrise and sunset calculation lookup table provided by this utility model, through its physical structure and simple and intuitive scale, enables users to quickly find the sunrise and sunset times of any location and any date. Through actual operation of this device, users can gain a certain understanding of relevant astronomical knowledge.

[0016] 2. This utility model features a simple and lightweight design, allowing users to easily carry the lookup table for use during travel, scientific research, or outdoor activities. The lookup table is structurally stable and durable, capable of long-term use under various environmental conditions, providing consistent performance. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a plan view of the motherboard in an embodiment of the present utility model;

[0019] Figure 3 This is a planar schematic diagram of the vernier in an embodiment of this utility model.

[0020] In the diagram: 1. Identifier for the main board; 2. Vernier; 3. Damping rubber strip. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Please see Figure 1 This utility model provides a technical solution: a sunrise and sunset calculation query table, including a matching main board 1 and a cursor 2.

[0025] In this embodiment, the main board 1 is a thin plate structure with a time difference indicator on its surface, and damping strips 3 are attached to the upper and lower ends of the main board 1.

[0026] In this embodiment, the vernier 2 is a transparent ruler structure with indicator lines and graduations on its surface. The upper and lower ends of the vernier 2 extend inward to form sliding portions. The vernier 2 is slidably connected to the main indicator board 1 via these sliding portions. The vernier 2 slides along the X-axis of the main indicator board 1 via these sliding portions and indicates the graduations. The sliding portions contact the damping rubber strip 3 during movement. The main function of the damping rubber strip 3 is to reduce the friction between the vernier 2 and the main indicator board 1, making the vernier 2 slide more smoothly and steadily. By providing appropriate resistance during sliding, it prevents the vernier 2 from moving too fast or too abruptly, thereby ensuring that the vernier 2 can stably stop at the desired graduation position, improving the accuracy and stability of the query.

[0027] In this embodiment, the time difference indicator on the main board 1 and the cursor 2 is printed or molded. Compared with other manual marking methods, the time difference indicator printed or molded can effectively prevent the marks from fading, blurring, or falling off during long-term use. Printing and molding technologies can use wear-resistant, light-resistant, and corrosion-resistant materials to ensure that the time difference indicator remains clearly visible during long-term use, guaranteeing the accuracy of the query. In actual use, the cursor 2 should be kept at the 0 mark during sliding, coinciding with the date line below the main board 1, and the indicator mark of the cursor 2 should be perpendicular to the sliding direction.

[0028] Please see Figure 2 In this embodiment, the time difference indicator includes a date indicator axis arranged along the lower X-axis of the main board 1, a longitude and time indicator axis arranged along the upper X-axis of the main board 1, and an indicator curve located between the date indicator axis and the longitude and time indicator axis. The indicator curve includes two types: one is a series of wavy curves, which are latitude-related lines; the other is a single curve with only four peaks, which is the time difference curve.

[0029] Please see Figure 3 In this embodiment, the scale range on the left side of the vernier 2 is 0-200, and the scale range on the right side is 0-20.

[0030] The scale range on the left (0-200) represents the value of the intersection with the latitude-related line, and is usually used to correct the half-day sunshine duration based on latitude. It is worth noting that the correction here means that the day and night are each half-day, that is, a half-day sunshine duration of 6 hours (360 minutes) is considered as zero correction. The actual half-day sunshine duration for the day is obtained by adding 6 hours (360 minutes) to the half-day sunshine correction value.

[0031] The right-hand scale range (0-20): This represents the value (in minutes) at the intersection with the time difference curve, and is usually read from the time difference curve and displayed here. This time difference value is a necessary parameter for determining the actual noon time (midday).

[0032] In this embodiment, the indicator curve includes a time difference curve and a latitude correlation line.

[0033] This utility model's sunrise and sunset calculation lookup table, by combining design elements such as a time difference indicator, latitude and longitude information, and a time difference curve, can accurately calculate the sunrise and sunset times for a user-selected date and location (latitude and longitude). Its core principle is based on the correlation between time difference and latitude in astronomical calculations, and the lookup is performed using the cursor 2 and the scale on the main board 1.

[0034] The specific query principle includes the following steps:

[0035] Determine the latitude and longitude of the location: Users need to know the longitude and latitude of the location they want to query in advance. Longitude determines the time difference between local time and standard time, and latitude determines the length of half-day.

[0036] To determine the average noon time at the location being queried: Move the indicator line of vernier 2 along the X-axis to the position of the corresponding longitude (longitude time indicator axis), and then read the time value marked above the axis. This is the average noon time of that location (including areas with the same longitude), and record the time.

[0037] Determine the time difference: Move the indicator line of vernier 2 along the date indicator axis to the date to be queried, find the intersection of the vernier 2 scale line and the time difference curve, and read the scale value to the right of the vernier 2 indicator line at that point. This value is the time difference for that day (in minutes). Add this value to the average noon time mentioned above, which is the actual noon time for that location (including areas with the same longitude) that day, that is, the time of midday. Record this value.

[0038] Determine the half-day sunshine correction value: Keep vernier 2 stationary and find the intersection of the vernier 2 indicator line and the latitude correlation line (if the latitude of the location being investigated is not on the already marked latitude correlation line, the position of the latitude on the map can be estimated based on the width of the upper and lower latitude correlation lines, and the scale value (in minutes) on the left side of the vernier 2 indicator line is read, which is the half-day sunshine correction value; add the obtained half-day sunshine correction value to 6 hours or 360 minutes to get the actual half-day sunshine duration for the day);

[0039] Determine sunrise and sunset times: Subtract or add the actual half-day duration from the previous noon time, and convert it to a specific hour and minute to obtain the sunrise and sunset times for that location on that day.

[0040] To more clearly illustrate the query principle of this utility model, this embodiment uses the process of querying the sunrise and sunset times of Harbin (126.6 degrees east longitude, 45.7 degrees north latitude) on January 1st as an example:

[0041] First, align the scale line of vernier 2 with the 126.6 degree mark on the longitude and time axis above the main board 1, and read the time value above. It is approximately 11:33, which is the average noon time (UTC) in Harbin.

[0042] Next, move the cursor 2 scale line to January 1st on the date axis below the motherboard 1, and check the value at the intersection of the scale line and the time difference curve (the value on the right side of the scale line). It is approximately 3.5 minutes here.

[0043] Adding the average noon time above to the reading, we get 11:36.5, which is approximately 11:37 (UTC). This is the actual noon time (the time of midday) in Harbin that day.

[0044] Keeping vernier 2 stationary, observe the value at the intersection of the scale line and the latitude correlation line, which is the partial sunrise correction value. Based on Harbin's latitude of 45.7 degrees, observe the left side value (left side value of the scale line) at the intersection of the 40-degree latitude correlation line and the 50-degree latitude correlation line with the vernier 2 indicator line. The values ​​are approximately -78.5 points and -115 points. Take the midpoint of the two sets of values ​​(note the non-linear changes), which is approximately -97 points.

[0045] Calculate the partial daylight hours: 360 - 97 = 263 minutes = 4 hours and 23 minutes

[0046] Calculate the sunrise time: 11:37 - 4:23 = 7:14;

[0047] Calculate the sunset time: 11:37 + 4:23 = 15:60 (16:00).

[0048] It is worth noting that the lookup table in the above embodiments covers the entirety of China. In practical applications, its structure remains unchanged; only some parameters and the range of latitude-related lines need to be modified to apply it to any country or region in the world. Furthermore, in the above embodiments, the positive and negative values ​​of the values ​​are indicated by "+" and "-" within the same range as the date axis, eliminating the negative value portion of the cursor indicator line. This allows for dual-use of a single value, thereby reducing the overall width of the device without sacrificing the longitude for querying.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sunrise and sunset calculation query table, comprising a mark main plate (1) and a cursor (2) in sliding fit, characterized in that: the mark main plate (1) is a thin plate structure provided with a time difference indication table on the surface, and the upper and lower ends of the mark main plate (1) are adhered with damping rubber strips (3); the cursor (2) is a ruler structure provided with indication lines and scales on the surface, and the upper and lower ends of the cursor (2) extend inward and form sliding parts, respectively, and the cursor (2) is connected with the mark main plate (1) in sliding fit through the sliding parts. The cursor (2) slides along the X-axis of the mark main plate (1) through the sliding parts and indicates the scales, and the sliding parts are in contact with the damping rubber strips (3) when moving. The time difference indication table and the indication lines and scales on the mark main plate (1) and the cursor (2) are obtained by printing or die pressing.

2. The sunrise and sunset calculation lookup table of claim 1, wherein: The time difference indication table comprises a date indication axis arranged along the X-axis of the lower side of the mark main plate (1), a longitude and time indication axis arranged along the X-axis of the upper side of the mark main plate (1), and an indication curve arranged between the date indication axis and the longitude and time indication axis.

3. The sunrise and sunset calculation lookup table of claim 1, wherein: The indication curve comprises a time difference curve and a latitude correlation line.

4. The sunrise and sunset calculation lookup table of claim 3, wherein: The cursor (2) is a transparent ruler structure.

5. The sunrise and sunset calculation lookup table of claim 4, wherein: ​ 6. The sunrise and sunset calculation lookup table of claim 1, wherein: ​

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