Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 49
determined by its re-lation to the sun. The nearest celes-tial body is themoon. Astronomershave found by fundamentally the same methods as thosewhich surveyors employ that its distance from the earthaverages about 240,000 miles, that its diameter is about2160 miles, and that its mass is about one… … Fig. 4. — The moon 1.5 days after the firstquarter. Photographed with the 40~inchtelescope of the Yerkes Observatory. CH. I, 8] PEELIMINARY CONSIDERATIONS 21 on the moon, and the telescope shows that its surface iscovered with mountains and circular depressions, many ofgreat size, which are called…
Astronomy
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