Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 222
the time T. Elements of a Planets Orbit.—When we know a and b (the major andminor semi-axes) for any orbit, the shape and size of the orbit isknown. Knowing a we also know T, the periodic time ; in fact a is foundfrom T by Keplers law III. If we also know the planets celestial longitude (Z) at a… … Fig. 130.—To Calculate the Place of a Planet in itsOrbit at any Future Time. The orbit lies in a certain plane ; this plane intersects the planeof the ecliptic at a certain angle, which we call the inclination i.Knowing i, the plane of the planets orbit is fixed. The plane of theorbit intersects…
Astronomy
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