The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 88
Fig, 83. from Fig. 85. Let M\i& the moon, E the earth, and EM theline joining their centres. Now, strictly speaking, the moondoes not revolve around the earth any more than the earth … Fig. 84. around the moon; but the centre of each body moves aroundthe common centre of gravity of the two bodies. The earth 70 ASTRONOMY. being eighty times as lieavy as the moon, this centre is situatedwithin the former, about three-quarters of the way from itscentre to its surface, at the point…
Astronomy
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