The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 268
he twelvetriangles, numbered 1, 2, 3, &c, over each of which the radius vector sweeps in equaltimes, are equal. 568. The third law of Kepler is, that the squares of the periodictimes of any two planets are proportioned to the cubes of their meandistances from the Sun. Take, for example, the… … 567. State theillustration ? law of Kepler? Explain it? B-G. 12 568. The third law? What 268 ASTRONOMY. According to these laws, which are known to prevail throughout the solar system,many of the facts of astronomy are deduced from other facts previously ascertained.They are, therefore, of great…
Constellations · Stars
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