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 132
he earth. But it is found that the sun diminishes sensibly thegravity of the moon to the earth. This, therefore, must also betaken into account, and the resulting value of the mass of themoon is found to be about -g^st of that of the earth. The density of the moon, being directly as the mass,… … shall find that it increases with the moons altitude, being leastwhen the moon is in the horizon and greatest when in thezenith. This increase is explained in Fig. 53. Let E be the centre of the earth, and-(J^^ ifthatofthemoon. With the distance between E andM as a radius, describe…
Astronomy
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