Berry, Arthur,b. 1862 · London, J. Murray · leaf 239
path of Mars, anaccurate drawing of which would be undistinguishable to the eyefrom a circle. The eccentricity is \ in the figure, that of Mars being fa. 186 A Short History of Astronomy [Ch. vii. shaded and unshaded portions of the figure represent equalareas each corresponding to the motion of… … Fig. 60.—Keplers second law. 141. Thus were established for the case of Mars the two im-portant results generally known as Keplers first two laws :— 1. The planet describes an ellipse, the sun being in one focus. 2. The straight line joining the planet to the sun sweeps outequal areas in any two…
Astronomy
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