Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 86
Let M be 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 around the moon: but the centre of each body moves aroundthe common centre of ^ravitv of the two bodies. The earth yO ASTRONOMY. being eighty times as heavy as the moon, this centre is situatedwithin the former, about three-quarters of the way from itscentre to its surface, at the point G. The…
Astronomy
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