The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 250
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 Meracry. — The realdiameter of Mercury is about three thousand miles. Itssize, compared… … cury; but Mercury is about one-fifth more dense than theearth. 220. Greatest Elongation of Mercury. — Mercury, beingan inferior planet (or one within the orbit of the earth),appears to oscillateto and fro acrossthe sun. Its great-est apparent distancefrom the sun, or itsgreatest elongation,varies…
Astronomy
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