Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 158
Fig. 154. To find the mass of the sun, we first ascertain the distance ASTRONOMY. 141 the earth would draw the moon towards itself in a given time,were the moon at the distance of the sun, and then form theproportion : as the distance the earth would draw the moontowards itself is to the distance… … sand times that of the earth, the pull of gravity at the surfaceof the sun is only about twenty-eight times as great as atthe surface of the earth. This is because the distance fromthe surface of the sun to its centre is much greater thanfrom the surface to the centre of the earth. 140. Size of the…
Astronomy
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