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This
simplified drawing illustrates the geocentnc model of Claudius Ptolemy
(fl. 140 A.D.). No attempt has been made to represent the relative size
of epicycles and deferents, nor are radial dimensions drawn to scale. Attention
is directed to the parallel positions of the radius vectors of the epicycles
of the superior planets (Mars, Jupiter, Saturn), and to the 'sun linked'
motions of the inferior planets (Venus, Mercury).
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