Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 116
the otherhand, the surfaceis pitted all overwith great craters,which resemblevery closely thevolcanic craters onthe earths surface,though on an im-mensely greaterscale. The largestterrestrial craters do not exceed six or seven miles in diameter; many of thoseon the moon are fifty or sixty miles… … Fig. 21.—A Normal Lunar Crater (Nasmyth). 106 LUNAR CRATERS AND MOUNTAINS. [§153 rounded by a mountain ring, which rises anywhere from 1000to 20,000 feet above the neighboring country. The floor withinthe ring may be either above or below the outside level; somecraters are deep, and some are filled…
Astronomy
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