In astronomy, in ancient Greece and Roman times there will be a new discovery and progress. The period of 6-3 BC, is the natural philosophy of the Ionian, appears a Mi Li school, school of Pythagoras and Democritus. And each school's understanding of astronomy are not the same. In the milesian school, Thales thought: is the air, nothing to support it. Moon is not itself light, but reflect the light of the Sun. The Sun and the Earth are the same, it is absolute pure fire. Pythagoras, they tried to establish a cosmology, mathematical ideas to think about the structure of the universe. In their view, the geometry of the sphere is the most perfect shape, and so the universe must be spherical, with the Earth at the center of the universe, the Earth is round. They also believe that the motion of celestial bodies are harmonious, is moving in a circle at a constant speed. Democritus School of thought: atoms and the void is the origin of all things, infinite universe contains infinite atoms and the infinite void.
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