Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 160
dently equals the triangle PfS. The difference ofthe two areas ASP and BSP is therefore the segment of the ellipsecut off by the chord Pk ; this segment is so very small that thearea ASP is very nearly equal to BSP. The angle ASP through which the planet has moved about thesun since perihelion is… … Fig. 76. Equal Areas in the Ellipse 148 LABORATORY ASTRONOMY It is convenient to refer the motion of the planet to that of ahypothetical planet moving in the orbit in such a way as to be atperihelion with the real planet and describe equal angles in equaltimes ; thus the anomaly of the so-called…
Astronomy
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