From the time the law of Copernicus was discovered and proved, the mere recognition of the fact that it was not the sun but the earth that moves sufficed to destroy the whole cosmography of the ancients. By disproving that law it might have been po ible to retain the old conception of the movements of the bodies, but without disproving it, it would seem impo ible to continue studying the Ptolemaic worlds. But even after the discovery of the law of Coper ......

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