The moon is a spherical celestial body revolving around the earth and a natural satellite of the earth. Commonly known as the moon or the moon, it was also called Taiyin, Xuantu, Chanjuan and Pan Yu in ancient times.

Rotate around (a larger celestial body)

The moon moves around the earth in a circular orbit. The great circle cut by this orbital plane on the celestial sphere is called "White Road". The ecliptic plane is neither coincident with the celestial equator nor parallel to the ecliptic plane, and its spatial position is constantly changing.

The cycle is 27.32 days. The average inclination of the lunar orbit (ecliptic) relative to the earth orbit (ecliptic) is 5 09'. But it is known that the moon gradually leaves the earth at an average speed of 3.8cm per year.