Orbs must [be] reciprocally as the squares of their distances from the centers about which they revolve: and thereby compared the force requisite to keep the Moon in her orb with the force of gravity at the surface of the earth, and found them answer... The Monist - 199. lappuselaboja - 1914Pilnskats - Par šo grāmatu
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| Norman Feather - 1961 - 386 lapas
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