jan 1, 1514 - Copernicus publishes "On the Revolutions of the Heavenly Spheres"

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Only shared privately with close friends due to his sensitivity towards scholars within the church who would oppose the ideas presented.

Proposed a heliocentric model, with the earth rotating on its axis, all planets rotating around the sun and the moon orbiting the earth. It still used circular orbits and many epicycles.

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