Why does mercury rise and fall at the same time when it transits, and Mars rises and falls at the same time?

The so-called transit refers to the phenomenon that two planets with smaller orbital radius than the earth run to the connecting line between the sun and the earth, that is, the planets fall on the apparent surface of the sun.

In ancient China, the so-called "Chong" refers to two points at both ends of a circle with the same diameter. Such as twelve earthly branches (Zi, Ugly, Yin, Mao, etc. ) Arranged in a circle in sequence, meridian and ugliness will collide, which is also a judgment basis in China's ancient fortune telling. So the collision between Mars and the sun, of course, is centered on the earth, and Mars and the sun are at both ends of the same diameter (depending on the position).

So when Mercury transits, it rises and falls at the same time, while when Mars rushes to the sun, it rises and falls. (Of course, the answer on the second floor is also very good. )