There was a time when most educated people knew that the Earth was the center of the universe. There was a sophisticated “Geocentric” model, known as the “Ptolemaic system”, that predicted to very high accuracy the observed movement of all the objects in the Heavens, as they purportedly orbited the Earth on perfect crystalline spheres. 500 years ago, anyone who proposed an alternative model—in which the Sun was the center and the Earth was just another planet orbiting it—was derided as a heretic and a madman.
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