The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 67
48 ASTRONOMY. … Fig. 57- follows that a planet must move fastest when at perihelion,and slowest at aphelion. Keplers Second Law of planetary motion is usuallystated as follows : The radius vector of a planet describesequal areas in equal times in every part of the planetsorbit. 46. Keplers Third Law. — Kepler…
Astronomy
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