How to pronounce Libra in the constellation Zhongtian _ constellation?

What is the transit constellation? How to check?

When you look at the astrolabe at ordinary times, the constellation where the head of 10 is located is the transit constellation.

In astronomy, the meridian is a point that celestial bodies such as planets, stars or constellations pass through in the process of Sunday motion, and it is the moment when celestial bodies are passing through the local meridian circle. In other words, the position of the celestial body at the highest point is also the moment when the celestial body is closest to the zenith.

Nature:

Sometimes, the upper transit is used to describe the above phenomenon, while the lower transit is another moment when celestial bodies pass through meridian circle, and the position at this time is the lowest point on the celestial sphere. (that is, the point closest to the bottom of the sky or farthest from the zenith).

The height of transit is the latitude of the observation point on the earth plus or minus the distance between celestial bodies and celestial poles. If it is 1 10, it should be changed to 70, if it is-100, it should be changed to -80, and so on. The horizon longitude and azimuth are the same, but if we do azimuth transformation, the difference between the values before and after the transformation is 180.

The time from the upper transit to the lower transit is 24 hours. Of course, the time from the upper transit to the lower transit is 12 hours. However, this is only a rough statement, because the earth runs in an elliptical orbit and celestial bodies have their own movements (if they are planets or the moon).

Strictly speaking, the earth movement is a "solar day" under this movement (that is, the time interval when the sun passes through the same transit in a certain place twice in a row, that is, the transit from top to bottom), which is a little longer than a sidereal day (the time interval when any star passes through the transit above a certain place twice in a row). The average difference is 1/3 19, because it takes the earth 365338+09 days to go around the sun.

Baidu encyclopedia-Zhongtian