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Published online by Cambridge University Press: 03 November 2016
page 504 note * [The approximation (B) is given by Rothe, Höhere Mathematik, Teil II, p. 121, § 7, where it is shewn that the error is of the order of 10-3. e8 where e is the eccentricity. It is given without proof in some English books on Practical Mathematics. Ed.]