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Delaunay, Charles-Eugène (1816-1872) astronomer and mathematician
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Autograph letter signed to J.C. Adams

Requests J.C.A. or someone appointed by him studies '8 Venus mean longitude - 13 Earth's mean longitude' in the Moon's motion, to settle who is right between Hansen and Delaunay. Will send cheque for Horrocks Memorial later. (See G.B.A. to J.C.A. 28th Oct. 1874).

Airy, Sir George Biddell (1801-1892) Knight, 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

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