Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 40
sun as a center. Tycho had observed withall assiduity, and Kepler, by discussing these observa-tions, had discovered the three laws which bear hisname. Galileo had not only enlarged astronomicalknowledge by the use of the telescope, but had pro-mulgated the laws of motion of bodies on the surface… … Fig. 6.—Sir Isaac Newton. 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…
Astronomy
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