Next, we’ll turn our attention to determining the size of Saturn’s epicycle. As he did for Jupiter, Ptolemy introduces a new observation. Continue reading “Almagest Book XI: Determining the Size of Saturn’s Epicycle”
Almagest Book XI: Jupiter’s Periodic Motions
Before moving on, Ptolemy describes how he arrived at the periodic motions of Jupiter, beginning with an ancient observation. Continue reading “Almagest Book XI: Jupiter’s Periodic Motions”