Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 63
een to move like theEarth and planets underthe dominating influence of the Suns attraction. Masses of Heavenly Bodies.—A very interesting con-sequence of the law of gravitation is its applicationto determine the masses of heavenly bodies. If themean distance between two bodies whose masses areM and… … Diag. XXVIII. THE LAW OF GRAVITATION 53 the Moon revolves, the formula may be applied to theEarth and Moon. By taking a to be the Suns meandistance and T the year, it may be applied to the Sunand Earth. The Suns distance is, let us say, 390 timesthat of the Moon, and the year is, roughly, 13…
Astronomy
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