A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 52
tly of the radius vector, at the two ends of the ellipse, the area overwhich the radius vector has traveled is the same in both cases. The same principle ob-tains in every part of the planetary orbits, whatever may be their ellipticity or the meandistance of the planet from the sun ; hence the… … 9. The third law of Kepler is, that the squares of the 73. State the second law of planetary motion. Define radius vector. (^Ji-plain this second law.) 4:8 ASTRONOMY. periodic times of any two planets are proportioned to thecubes of their mean distances from the sun. 1. Take, for example, the earth…
Astronomy
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