Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 59
but at different rates. Thisstructure of the heavens is shown in section in Fig. 49. 41 42 ASTRONOMY. 37. Cycles and Epicycles.—The ancients had also noticedthat, while all the planets move around the heavens fromwest to east, their motion is not one of uniform advance-ment. Mercury and Venus… … Fig. 49- The ancients assumed that the planets moved in exactcircles, and, in fact, that all motion in the heavens wascircular, the circle being the simplest and most perfectcurve. To account for the loops described by the planets,they imagined that each planet revolved in a circle around acentre,…
Astronomy
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