Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 252
ense shown) measured in the plane of the orbit; it isnot, strictly speaking, a longitude. The mean motion or period,together with the epoch, i.e. the position of the planet at somespecified time,are sufficient to determine its position in the orbitat any subsequent time, the shape and size of the… … Fig. 78.- -The Elements of a PlanetsOrbit. 123. Stability of the Solar System.—The elements ofany planetary orbit would be absolutely constant if the Sun,assumed spherical, and the planet alone constituted the solarsystem. The mutual attractions of the planets, however, 218 GENERAL ASTRONOMY…
Astronomy
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