Brennan, Martin Stanislaus, 1845-1927 · New York : The Catholic publication society co. · leaf 219
sweeps over equalareas in equal times, isKeplers second law. Although the planetwhen in the part of itsorbit nearest the sunmoves more rapidly andpasses over a greaterarc in the same inter- Fig. 13.-Radii Vectores. yal of time tnan when it is farthest away, still the triangular space travelledover… … Celestial Laws. 211 Universal Gravitation—Newton generalized the lawsof Gravitation by showing that they extended to themoon, the planets, and the sun. Newton knew that if the force of gravity reachedfrom the earth to distant bodies, it should decreaseas the square of the distance from the earths…
Astronomy
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