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Sidereal time estimation method

A sidereal time and time zone technology, applied in the field of sidereal time estimation, can solve the problems of low-level, complicated calculation, large sidereal time error, etc., to achieve the effect of convenient use, small size and simple structure

Inactive Publication Date: 2012-02-15
YUNNAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, the influence of human factors is greater, and the sidereal time estimated by experience has a greater error
The sidereal time is mainly determined by the local geographical longitude, time zone, date, time, etc., and the calculation is cumbersome. However, excellent astronomical observation stations are mostly located on high plateaus above 3,000 meters above sea level. frequent low-level calculation errors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: local time to sidereal time:

[0033] (1) Turn the 0h of the middle dial to the time zone scale of the local time on the lower dial.

[0034] (2) The middle plate does not move, and the autumnal equinox day on the upper plate is transferred to the local geographic longitude.

[0035] (3) Fix the upper plate and turn the 0° position of the middle plate to the date scale to be estimated.

[0036] (4) Finally, find the scale of the estimated local time from the outer edge of the center plate. The time scale on the bottom plate corresponding to this scale is the estimated sidereal time.

[0037] Taking the Lijiang Astronomical Observatory of the Yunnan Astronomical Observatory of the Chinese Academy of Sciences as an example, the sidereal time of the station at 22:00 Beijing time on October 1 is estimated. Beijing time is East Eight District time, that is, UT+8, and the longitude of Lijiang Astronomical Observatory is E 100°01’51”.

[0038] First, turn the mi...

Embodiment 2

[0042] Embodiment 2: Universal time to sidereal time:

[0043] Compared with the process of "Example 1", it is only in step (1) that the 0h of the middle plate is transferred to the 0h of the upper scale of the lower plate, that is, the UT scale. Other steps are exactly the same as "Example 1". Finally, the time corresponding relationship between the outer edge of the middle plate and the lower plate is obtained, which is the corresponding relationship between the universal time and the time stars.

Embodiment 3

[0044] Embodiment 3: local solar time to sidereal time:

[0045] (1) Turn the middle plate 0h to the 0h scale of the bottom plate.

[0046] (2) Fix the middle disk and turn the autumnal equinox date of the upper disk to 0° of the middle disk. The two steps (1) and (2) are to align the autumnal equinox day of the upper plate with the 0h scale of the lower plate by means of the corresponding relationship between the two scales on the middle plate.

[0047] (3) Fix the upper plate and move the middle plate to the date scale to be estimated.

[0048] (4) The outer edge of the middle plate is solar time, and the corresponding scale is sidereal time.

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Abstract

The invention relates to a sidereal time estimation method, which is applicable to astronomical observation and astrophysical research. The local sidereal time of the time of one day in one year on one longitude of the earth can be estimated. An apparatus with a lower plate, a middle plate and an upper plate is adopted for estimation, the three plates are connected via a rotating shaft, the centers of the three plates are overlapped on the rotating shaft, the middle plate and the upper plate respectively and independently rotate around the rotating shaft, the ring-shaped lower plate is provided with round scales to divide a circle into 288 portions, and each scale indicates five minutes. The scales are marks of sidereal time scales and time zone scales, and the estimation of the sidereal time can be realized through rotating the round plates, the sidereal time of the certain time can be calculated, and the corresponding relationship between the sidereal time and the local time, the world time or the solar time in one day can be directly reflected.

Description

technical field [0001] The invention is a method for estimating the sidereal time, which is suitable for estimating the local sidereal time at a certain time of a certain day of a year and a certain longitude on the earth in the process of astronomical observation and astrophysics research. Background technique [0002] In astronomical observations, sidereal time is a very important quantity, which reflects the position of the celestial sphere at a certain place and at a certain time. In astronomical observation, the calculation of sidereal time mainly has the following methods: [0003] (1) Using electronic technology or computer technology, their advantage is accurate calculation. However, instruments and equipment are generally large in size and are easily restricted by surrounding hardware and software conditions (for example: factors such as electricity, computer hardware, software, and network in the process of astronomical site selection); The methods of these metho...

Claims

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Application Information

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IPC IPC(8): G06C3/00
Inventor 李少昆
Owner YUNNAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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