A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 315
nts the Ptolemaic System,except that no attention is paid to dimensions, the deferents being spaced 302 THE PLANETS. ;tl equal distances. It will be noticed that the epicycle-radii which carry attheir extremities the planets Mars, Jupiter, and Saturn are all always parallelto the line that joins… … Fig. 164. — The Ptolemaic System. cases revolved in the deferent once a year, always keeping exactly betweenthe earth and the sun : the motion in the epicycle in this case was completedin the time o£ the planets period, as we now know it. He ought to haveseen that, for these two planets, the…
Astronomy
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