Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 330
the end of thisperiod each repeats the same series of motions relative tothe 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 EM, from E, tangent to the orbit of either of… … Fig. 84. elongation varies with the position of the earth. In thecase of Mercury it ranges from 16° to 29°, while in thecase 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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