In the field of astronomy, there have been new discoveries and advances in ancient Greece and Rome. BC 6-3 this time is one period of the brilliant period of natural philosophy. During this period there are m force school, Pythagoras and Democritus school. And each school's understanding of astronomy is not the same. In the milesian school, Telles thinks: the ground is stuck in the air in the air, nothing to support it. The moon does not shine itself, it is the reflection of the sun's light. The sun and the earth are the same, are a group of absolutely pure fire. The Pythagoreans, they tried to establish mathematical thinking to view cosmology and the structure of the universe. In their view, is the most perfect spherical three-dimensional geometry, so the universe must be spherical. They believe that the universe is centered on the earth, and the earth is round. They also believe that the celestial movement is harmonious, is to do a circular motion at a constant speed. Democritus school believe that the essence of the universe is atomic and void. Infinite universe contains infinite atoms and infinite void.
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