tion ofthe radial force is to increase the ec-centricity of the lunar orbit, when thesun is in line, or nearly in line, withthe longer axis. Thus, we perceive, that under the disturbing action of thesun, the eccentricity of the moons orbit must be in a stateof perpetual change, now more, now less,… … 196 ASTRONOMY. Chap. IV. Effect ofthe radialforce on themotion ofthe lunar p.eri-.?ee. Fig. 40. OS O S Retrogrademotion of theperigee andapogee. The majoraxis of thelunar orbit isinclined tofollow thesun. (184.) Now let us examine the effect of the radial forceon the position of the lunar apogee.…
Astronomy
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