Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 350
us sizes, but all of a very simple char-acter. Their general form can be made out by the aid ofFig. 89, and their dimensions by the scale of miles atthe bottom of it. The largest and most prominentfeatures are known as craters. They have a typical formconsisting of a round or oval rugged wall… … Fig. 89.—aspect op the moons surface. the plane surface of the moon already described. It is,however, generally covered with fragments or broken up 330 ASTRONOMY. by small inequalities so as not to be easily made out. Inthe centre of the craters we frequently find a conical for-mation rising up to…
Astronomy
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