Orr, M. A. (Mary Acworth) · London and Edinburgh, Gall and Inglis · leaf 189
les anddeferents, and the directions of the several movements,but epicycles and spaces between deferents are all mad^equal. It will be noted that the sun has no epicycleand that the moon turns on hers in a reverse directionthat the centres of those of Mercury and Venus are ina line with the sun,… … 30,000 years. One siderealmonth (27^ dya.) Fig. 35. The Ptolemaic system. The arcs of circles are portions of the deferents which carry round the smaller circles(the epicycles) in the periods named at the side. 152 PTOLEMY. all the wandering stars is the sphere of the fixed stars,moving in its vast…
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.
