Sacred Texts: The Classics

Aristotle: On The Hevens: Book II: Chapter 6

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We have next to show that the movement of the heaven is regular and not irregular. This applies only to the first heaven and the first movement; for the lower spheres exhibit a composition of several movements into one. If the movement is uneven, clearly there will be acceleration, maximum speed, and retardation, since these appear in all irregular motions.

Aristotle: On The Hevens: Book II: Chapter 6

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