More Sophisticated Epicycles

More Sophisticated Epicycles - More Sophisticated Epicycles...

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More Sophisticated Epicycles: The Ptolemaic Universe However, in practice, even this was not enough to account for the detailed motion of the planets on the celestial sphere! In more sophisticated epicycle models further "refinements" were introduced: In some cases, epicycles were themselves placed on epicycles, as illustrated in the adjacent figure. In actual models, the center of the epicycle moved with uniform circular motion, not around the center of the deferent, but around a point that was displaced by some distance from the center of the deferent. That ancient astronomers could convince themselves that this elaborate scheme still corresponded to "uniform circular motion" is testament to the power of three ideas that we now know to be completely wrong, but that were so ingrained in the astronomers of an earlier age that they were essentially never questioned: 1. All motion in the heavens is uniform circular motion.
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