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Delaunay, Charles-Eugène (1816-1872) astronomer and mathematician
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Copy of letter to C. Delaunay

Translation into French of JCA's original. Probably done by or for Delaunay. See JCA's English draft at 16/15/2; transcript of same at 36/20/1. Letter or extract of letter collected for MacAlister's biography.

Adams, John Couch (1819-1892) astronomer

Copy of letter to G.B. Airy

Explanation of how G.B.A. has misunderstood Delaunay's lunar formula. Agrees about stability of solar system. Would like to see model of transit of Venus.

Adams, John Couch (1819-1892) astronomer

Copy of letter to G.B. Airy

Has been checking errors in G.B.A's Numerical Lunar Theory: cause is Delaunay's coefficients of parallax. Explains why.

Adams, John Couch (1819-1892) astronomer

Copy of letter to S. Newcomb

Details of forthcoming sale of Babbage's mathematical books. Death of Delaunay. Letter or extract of letter transcribed for MacAlister's biography.

Adams, John Couch (1819-1892) astronomer

Copy of letter to W. De La Rue

[JCA's comments on De La Rue's speech on awarding Gold Medal of RAS] Acknowledges copy of Hansen's letter sent. Disagrees with H's assertion that he never contested JCA's theory of the secular acceleration of the moon: H caused LeVerrier to attack JCA and Delaunay, and is now adapting his own theory without admitting it might be wrong.

Adams, John Couch (1819-1892) astronomer

Copy of letter to W. De La Rue

Comments on De La Rue's speech on awarding Gold Medal of RAS to JCA. Whether a quotation from Herschel should be included. Whether LeVerrier should be mentioned in light of his and Delaunay's part in the controversy over the secular variation of the moon's mean motion. Accuracy of Hansen's and Plana's theories. Encloses copy of Delaunay's letter.

Adams, John Couch (1819-1892) astronomer

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