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EPICYCLE (Gr. upon, and KuKXos, circle)

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Originally appearing in Volume V09, Page 686 of the 1911 Encyclopedia Britannica.
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See also:

EPICYCLE (Gr. upon, and KuKXos, circle)  , in See also:ancient See also:astronomy, a small circle the centre of which describes a larger one . It was especially used to represent geometrically the periodic apparent See also:retrograde See also:motion of the See also:outer See also:planets, See also:Mars, See also:Jupiter and See also:Saturn, which we now know to be due to the See also:annual revolution of the See also:earth around the See also:sun, but which in the Ptolemaic astronomy were taken to be real .

End of Article: EPICYCLE (Gr. upon, and KuKXos, circle)
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