168 GKAVITATION. that plane. In this case, then, there is no disturbance in latitude; we must, therefore, in the following inves- tigation, suppose the orbit inclined to the plane of the equator. In fig. 50, then, let us consider (as before) the effect of the attractions of the two lumps at D and… … Now D is nearer to B than E is; also the line D B is more inclined than E B to A B. If the attraction of D alone acted, it would in a certain time draw the satellite to d; and fd would be the part of the motion of B, which is perpendicular to A B ; and this motion is upwards. In like manner, if the…
Perturbation · Planets · Satellites · Lunar theory
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