Evershed, M. A. (Orr) · London : Gall & Inglis · leaf 175
Fig. 29. The Epicycle.Ptolemys method of accounting for movements such as those shown in Fig. 28, … Fig. 30. Planet retrograding, and in opposition {i.e. in opposition to the sun.) PTOLEMY. 141 two motions neutralize one another, so that it appearsstationary, as Mars did on August 22, 1909. Afterthis, the motion of the epicycle more than counter-balances the motion of the deferent, and the…
Dante Alighieri, 1265-1321 · Astronomy
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