Orr, M. A. (Mary Acworth) · London and Edinburgh, Gall and Inglis · leaf 176
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 oppositionto 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, Ancient · Astronomy, Medieval · Early maps
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
