Abstract
The computation of the secular variation of the inclination and eccentricity of the Moon's orbit due to tidal forces is revised. Also the effect of the Earth's ellipticity, which amounts to 10−6 to 10−5 of the value for the spherical earth, is estimated and found to be negligible. The results agree well with the computations of Kaula [7], as opposed to MacDonald's results [8] which display an order-of-magnitude difference in the variation of the eccentricity, apparently due to a printing error. Finally, solutions are presented for various values of the dissipation factor.
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