Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 41
same force which pulls the apple to the earth controls the motion of the moon, and binds the planets to the gravitation. sun. This force is not constant in intensity, but varies inversely as the square of the distance. Keplers laws have been proven to be necessary consequences of the 34 A Study of… … Fig. 7.—Laplace. attractions for one another, are all explained by thissimple law. If Newtons law be correct, will not the mutual attrac-tions of the planets so derange their orbits that at last Introduction and Historical Sketch. 35 there will be wreck and ruin, where now are order andbeauty?…
Astronomy
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