The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 93
spheres are proportional to thecubes of their radii, the volume of the sun bears to that of theearth the enormous ratio of 1,286,000 to 1. By observations and calculations which will be described inthe Chapter on Gravitation (see Art. 114), the mass of the sun isfound to be about 327,000 times that… … 88 ORBIT OF THE EARTH. THE EARTHS ORBIT. 96. Revolution of the Earth about the Sun.—Up to this pointwe have spoken of the apparent annual motion of the sun in theecliptic from west to east, as though the earth were really at rest,and the sun revolved about it in its orbit. But when we takeinto…
Astronomy
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