Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 57
the bullet would move round the Earth in acircle. Movement in Ellipses.—Under what conditions willthe planets describe ellipses round the Sun in accord-ance with the laws discovered by Kepler ? Newtonwas able to answer this question fully. From thesecond law, that equal areas are swept out in… … THE LAW OF GRAVITATION 47 varies inversely as the square of the planets distancefrom the Sun. From Keplers third law he showedthat the Suns attraction is the same for all the planets,the amount depending only on the inverse square ofeach planets distance from the Sun. Law of Gravitation.—In this…
Astronomy
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