Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 107
gravitational attraction of another body which isin one of the foci, then the line joining the body to theother focus will rotate at a constant rate which is equal tothe mean rate of rotation of the body about the former focus,provided that the eccentricity of the orbit is small. Thetheorem is an… … Fig. 35.—The Moons Libration inLongitude. THE MOON 93 successive positions of the Moons centre. Let Ai be thepoint on the Moons surface which is in the line FJS produced.Then when the centre of the Moon is at M^, A^ will havemoved to A^, on the line MJF, because the rate of rotationof the line FM…
Astronomy
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