Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 138
t part. The lower part of the figurerepresents a part of the great plain, called Mare Imbrium. The smaller circular formations have every appearance ofbeing true volcanic craters. In some of these the centraldepression consists of a deep cavity, apparently terminatingin a point ; in others the… … Fig. 57. Copernicus. Explanation. Pig. 57 represents the ring mountain Copernicus. It is com-posed of terraces and ridges separated by deep ravines. The diameter of the en-closed area is more than 50 miles. Rising from the enclosed plain are 5 or 6 peaks,one of which is nearly half a mile in…
Astronomy
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