Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 149
its position at any other time let t be the time which 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 5 TT tArea of whole ellipse ~ T 128 ASTRONOMY. Ilie times r and T beiug both given, the problem is… … PlG. 53. etry as follows : Let A Bhe the major axis of the ellipse, P theposition of the planet, and Sthat of the focus in which the sun issituated. On A B a,s s. diameter describe a circle, and through Pdraw the right line P P D perpendicular to A B. TJie area of the elliptic sector SPB, over…
Astronomy
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