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 249
Freia Fig. 249. 226 ASTRONOMY. from the earth at inferior conjunction also varies considera-bly. Mercury is nearest to the earth when its inferiorconjunction occurs at its own aphelion and at the earthsperihelion. 218. Apparent Size of Mercury. — Since Mercurys dis-tance from the earth is variable,… … Fig. 250. planet is also variable. Fig. 252 shows its apparent size atits extreme and mean distances from the earth. Its appar-ent diameter varies from five seconds to twelve seconds. 219. Volume and Density of Mercury.—The realdiameter of Mercury is about three thousand miles. Itssize, compared…
Astronomy
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