What do zenith and transit mean in astronomy?

Zenith: The zenith, the upper meridian, has two straight lines running through the astrolabe, horizontally across the horizon, and from top to bottom across the meridian. The eastern and western ends of the horizon (on the right and west of Zuo Dong), namely the heads of the first and seventh houses, are called Ascending Point (asc) and Descending Point (des) respectively, and the upper and lower ends of the meridian, namely the heads of the tenth and fourth houses, are called Zenith (mc) and Zenith (ic) respectively. Zenith represents the goal you pursue all your life. Zenith constellation implies the way and style of climbing zenith. The house and constellation where China Shenxing is located can tell a person the level of concern when pursuing status, while the planets in Zhongtian Palace give a person a special ability to pursue zenith. Therefore, if a person's transit stage is not good, then he will climb to the top of his life with great difficulty. Midheaven: In astronomy, celestial bodies such as planets, stars or constellations pass through a point during the movement on Sunday, which is observed as the moment when celestial bodies pass 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. 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. For any latitude, there will be three situations: the celestial body is always on the horizon, even on the lower meridian, which is the constant horizon. When the absolute value of declination plus geographical latitude is greater than 90 (when the absolute value of declination is greater than the complementary angle of geographical latitude). Celestial bodies are always below the horizon, even if they are in the sky. This is the constant hidden circle. When the absolute value of declination minus geographical latitude is greater than 90 (when the celestial body is in another hemisphere, the absolute value of declination is greater than the complementary angle of geographical latitude). The upper meridian is above the horizon and the lower meridian is below the horizon, which is another case (when the absolute value of the declination of the celestial sphere is less than the complementary angle of the geographical latitude). In the third case, the sky completely corresponds to the cosine of geographical latitude (on the equator, all celestial bodies will haunt because they revolve around the north and south poles of meridian circle. At the pole, all celestial bodies will not rise or fall because they rotate around an axis perpendicular to the pole. The first and second cases account for half of the remaining celestial spheres. 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 sun passes through the same transit twice), which is a little longer than a sidereal day (any star passes through the same transit twice). The average difference is 1/3 19, because it takes the earth 365338+09 days to go around the sun.