The spheres of the planets do not revolve about the earth as their center, but about the sun.
Heliocentric model of the solar system
From 'De Revolutionibus Orbium Coelestium', Book I, Chapter 10
1543
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"Therefore, if any motions are attributed to the earth, they must produce in the celestial phenomena an appearance exactly the reverse of that which is observed."
Controversial"For if the earth should move from west to east, the fixed stars would appear to move from east to west."
Controversial"The earth has a spherical shape, for it is bounded on all sides by the circumference of a circle."
Controversial"The difficulty of the task, and the novelty of the opinion, almost deterred me from publishing the work."
Strange & Unusual"And so, having obtained the opportunity, I now propose to explain the motions of the heavenly bodies, and the order of the universe, with greater certainty than has hitherto been possible."
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