Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 43
38 ASTRONOMY. II. The radius-vector of each planet sweeps over equal areasin equal times. The radius-vector is the line drawn from the sun toany point of the orbit, as SP, SP1, SP2, etc., in Fig. 8. / we … Fig. 8.—Illustrating Keplers Second Law. In this figure suppose that PP1, P2P3, and P4P5 eachrepresent the path of a planet for two weeks. Thenthe three shaded parts will be equal in area. III. The squares of the times of revolution of two planetsare proportional to the cubes of their distances…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
