Orr, M. A. (Mary Acworth) · London and Edinburgh, Gall and Inglis · leaf 178
e period of hisepicycle, while a little less than two years was the 142 PTOLEMY. period of the deferent. The two periods of Saturnare 378 days and 29J years nearly; of Jupiter 399days and nearly 12 years. Venus and Mercury betray their dependence uponthe sun in more striking fashion, for since… … Fig. 31. Venus, Mercury, and the sun. September 25, 1911, Mercury was seen from Earthas a morning star as far west of the sun as it ispossible for him to travel, while Venus, after shiningas an evening star all the summer, had come into linewith the sun and become invisible.^ On December…
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.
