Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 28
and down are not invariable^hut are always toward or from thecentre of the earth. — Therefore,they are different at different pointsof the earths surface. HI. The earth is completely isolated in space.—Themost obvious proof of this is that men have visited nearlyevery part of its surface without… … Fig. 2. Illustrating the fact that theportions of the earth visiblefrom elevated positions, 5. S,S, etc., are bounded by circles. 10 ASTRONOMY. so immense^ that the raagnitudes of the bodies themselvesare insignificant in comparison. The first conception the student of astronomy has toform is that…
Astronomy
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