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It was a German astronomer by the name of Johannes Kepler who did a whole lot of geometrical calculations from new and unusually accurate observations made by Tycho Brahe. Kepler showed that the planets each move in an elliptical orbit and he gave three laws describing exactly how they move, and it was found to be much more accurate than the previous models of Ptolemy and Copernicus.

He did not know why they behaved as they did and we had to wait until Isaac newton explained it using his new theory of gravity.

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10y ago

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