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Essentially he took the center of the cosmos and changed it from everything circling the Earth, to everything circling the sun. While not the first to propose this, he was the first to have his incantation of this idea spread widely. He did not change from the idea of crystalline spheres or remove epicycles and deferents. He used circular motion, not ellipses (that wouldn't happen until Kepler). It was a radical proposition nonetheless and it was rejected as incorrect or even heresy for quite some time.

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Q: What major changes did Copernicus make in the ptolmaic system why was this change significant?
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