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 245
. I. GENERAL CHARACTERISTICS OF THEGROUPS. 213. The Inner Group. — The inner group of planetsis composed of Mercury, Venics, the Earth, and Mars:that is, of all the planets which lie between the asteroids 222 ASTRONOMY. and the sun. The planets of this group are comparativelysmall and dense. So far… … this group are shown in Fig. 245. The dots round the orbitsshow the position of the planets at intervals of ten days. 214. The Outer Group.—The outer group of planetsis composed of Jupiter, Saturn, Uranus, and Neptune.These planets are all very large and of slight density. Sofar as known, they…
Astronomy
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