Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 332
nd of thisperiod each repeats the same series of motions relative totlie sun. What these motions are can be readily seen bystudying Fig. 84. In the first place, suppose the earth,at any point, E, of its orbit, and if we draw a line, E Lor E M, from E, tangent to the orbit of either of theseplanets,… … Fig. 84. elongation varies with the position of the earth. In thecase of Mercury it ranges from 16° to 29°, while in tliecase of Venus, the orbit of which is nearly circular, it varies very little from45°. These planets,therefore, seem to havean oscillating motion,first swinging toward theeast of…
Astronomy
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