The Earth's rotation and revolution Movement was originally astrometry and ground studies of common research topics, but the methods and goals of different.
地球的自转运动和公转运动本来就是天体测量学和地学共同的研究课题，但方法和目的有所不同。
Earth's rotation and keep the revolution, while the crust is constantly changing internal.
地球在不停地自转和公转，同时地壳内部也在不停地变化。
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