Sacred Texts: The Classics

Aristotle: On The Hevens: Book II: Chapter 8

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Since changes evidently occur not only in the position of the stars but also in that of the whole heaven, there are three possibilities. Either (1) both are at rest, or (2) both are in motion, or (3) the one is at rest and the other in motion. (1) That both should be at rest is impossible; for, if the earth is at rest, the hypothesis does not account for the observations; and we take it as granted that the earth is at rest.

Aristotle: On The Hevens: Book II: Chapter 8

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