Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 261
s in kilogrammes (or pounds) and attractions. The attraction of the Earth is known. It is such as to causebodies to have their observed weights. Hence the mass of the Earthbecomes known. The volume of the Earth is known from geodetic 240 ASTRONOMY. surveys. The density of the whole Earth is… … Fig. 152. Determination of the Mass of the Earth in Terms of the Mass of theSun.—The mass of the Earth expressed in tons or pounds is knownThe mass of the Earth in fractions of the Suns mass (= 1.0) can bedetermined by calculating how far the Earth is deflected by the Sunsattraction each second, as…
Astronomy
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