Ec Cp

In the hands of the ancient Greeks, the epicycle-deferent mechanism was employed skillfully to account for many different irregularities in the motions of the heavenly bodies. By altering the relative sizes of the two circles and their directions of rotation, different effects could be produced, and by placing epicycles upon epicycles, extremely complex motions could be generated. This basic mechanism was the cornerstone of all quantitative planetary theories until the time of Kepler. Even Copernicus, who succeeded in removing the need to

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