Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 226
ies away in thetangent AD. It would move away in that direction forever if the Earthdid not attract it downwards. extend ? Why should it not extend to the Moon ? If itdoes, the Moon would tend to drop towards the Earth, justas a stone thrown from the hand drops. As the Moonmoves round the Earth in… … Fig. 132.—Sir Isaac Newton. Born 1642 ; died 1727. 205 206 ASTRONOMY. Earth did not attract it. Why should not the force whichmakes the stone fall be the same force which keeps theMoon in her orbit ? To answer this question, it was necessary to calculatethe intensity of the force which would keep…
Astronomy
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