A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 323
810 THE PLANETS. the sun ; and his third, or harmonic law, was then discovered simplyby making a comparison between the distances thus found and thecorresponding periods. 518. Mean Distance of an Inferior Planet by Means of Observa-tions of its Greatest Elongation. — By observing from the earth the…
Astronomy
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