一、技术领域本实用新型涉及一种可方便准确演示地球、月球绕太阳公转并自转,而且能够实现彼此以一定比例的转速及方位变化的装置,特别涉及地球、月球及太阳运转演示仪。二、技术背景现行已有的关于地球、月球及太阳三球运转的仪器,有的采用球面演示方式。有一种天体演示仪,它结构简单,但不能直观地反映三球体之间的空间运动关系;也有专门研究天文的专业机构已设计制造出能精确电子显示日、月蚀等的 I. Field of the Invention The present invention relates to a device that can conveniently and accurately demonstrate that the Earth and the moon revolve around the sun and that can rotate at a certain rate and azimuth. In particular, it relates to the Earth, the Moon and the Sun-operated Demonstrator. Second, the technical background Existing existing earth, the moon and the sun three-ball operation of the instrument, and some spherical presentation. There is a celestial demonstrator, it is simple in structure, but can not intuitively reflect the spatial movement of the relationship between the three spheres; also specialized in astronomy professional agencies have been designed to accurately display the date of eclipse, lunar eclipse