Mainly used to demonstrate that the moon revolves around the earth a week at the same time, the rotation of the phenomenon of a week,
The lunar instrument includes four parts: the globe, the moon, the arm and the base.
Specification: globe diameter 141.6mm, lunar instrument diameter 100mm
The observation of different periods in the monthly lunar earth month, different days on earth observation of the moon infested time, also can explain the observation of earth on the moon.
