The motion of the celestial bodies is uniform, circular, and perpetual, or composed of circular motions.
Heliocentric model of the solar system
From 'De Revolutionibus Orbium Coelestium', Book I, Chapter 4
1543
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"Thus, the Sun, remaining in one place, illuminates all the planets equally, as if it were a candle placed in the middle of a room."
Strange & Unusual"For the motion which appears to us in the heavens is not in the heavens themselves, but in the earth."
Controversial"The sphere of the fixed stars is immovable and embraces all things."
Controversial"Those things which I am saying now may be obscure, yet they will be made clearer in their proper place."
Strange & Unusual"For it is not the magnitude of the stars, but the magnitude of their distance from us, that causes them to appear small."
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