A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 51
, 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 rule, that the radius rector describesequal areas in equal… … 78. State the second law of planetary motion,plain this second law.) Define radius vector. (Ex- 4S ASTRONOMY. MAR3 IN euNJiNCTION e 6 6 periodic times qfany two2>lanett< are proportioned to thecubes of their mean aistancesfrom the sun. 1. Tike, for example, the earth and Mars, whose periods…
Astronomy
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