Study on Lunar Calendar

The calendar formed on the Earth cannot be copied to the Moon.The moon is located in a hierarchically nested multilevel coordinate system.Lunar observers choose different references from different levels of coordinate systems, and different rotation periods and revolution periods will be measured. On the surface of the moon, observers can be divided into: the observersfacing the Earth, the observerssituated on the lunar far side, halo observers, and the observers of the lunar equator. These four types of observers see different phenomena of celestial cycle. The lunar calendar is periodicity and localized. The Earth is the best reference for the moon’s rotation and revolution cycle. Compared to the Earth, the moon has no rotation, only swing. Compared with the sun and the stars, the revolution of the moon around the earth can be regarded as the rotation of the moon, but the motion of speed from the moon is not uniform.