The Collected Mathematical Works of George William Hill, Vol. 4 (Classic Reprint)

In this care must be taken to have a, e and y of the same signification in all the factors. When we neglect the inclination of the lunar orbit the last term may be neglected.

The advantage of the employment of such a formula as this over the one employed by Mr. Stockwell consists in the circumstance that since the first factors are non-periodic, the second may be limited to their non-periodic terms. The expression is correct, however far we may wish to push the approximation in reference to powers of the solar disturbing force.

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