Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 41
two inner ones,Venus and Mer-cury, have one or more satellites. The earth has onesatellite, the moon; and the satellites of the otherplanets are often called their moons. These satellitesall revolve around their planets, just as the planets re-volve about the sun, and are carried with them by… … Fig. 6.—The Comparative Size of the Planets. GENERAL VIEW OF THE SOLAR SYSTEM. 37 I. The planets move in ellipses, with the sun in one focus. Before the discovery of this law, astronomers hadalways assumedthat the planetsmove in circles,and it must not beforgotten that theseellipses are…
Astronomy
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