Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 28
llup 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 ih> earth visiblefrom elevated positions, 3, $,S, etc., are bounded by circles. 10 ASTRONOMY. ■so immense, that the magnitudes of the bodies themselves are insignificant in comparison. The first conception the student of astronomy lias toform is…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
