Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 147
its position at any other time let r be the time wrhich has elapsedsince passing the perihelion. Then, by the law of areas, if P be theposition of the planet at this time we shall have Area of sector P Sir Area of whole ellipse (1). 128 ASTRONOMY. The times r and T being both given, the problem is… … Fig. 53. etry as follows : Let A B be the major axis of the ellipse, Ptheposition of the planet, and £ that of the focus in which the sun issituated. On A B as a diameter describe a circle, and through Pdraw the right line P* P D perpendicular to A B. The area of the elliptic sector SPB, over which…
Astronomy
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