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Delaunay, Charles-Eugène (1816-1872) astronomer and mathematician
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Draft autograph letter signed to Simon Newcomb

Proper comparison of Hansen's and Delaunay's equations of Longitude, Latitude and Parallax [of the moon] much needed. Description of such comparisons as already exist. JCA's own parallax tables. Tables of Moon's Ephemeris might be obtained from Hind: JCA will enquire. Hill's computation of the perturbations of Jupiter and Saturn very worthy.

Adams, John Couch (1819-1892) astronomer

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 16/17/3; transcript of same at 36/21/3. Letter or extract of letter collected for MacAlister's biography.

Adams, John Couch (1819-1892) astronomer

Copy of letter to C. Delaunay

See JCA's draft at 16/14/1-2; Delaunay's French translation at 36/16/1. Letter or extract of letter transcribed for MacAlister's biography.

Adams, John Couch (1819-1892) astronomer

Copy of letter to C. Delaunay

See JCA's draft at 16/16/2; Delaunay's French translation at 36/17/3. Letter or extract of letter transcribed for MacAlister's biography.

Adams, John Couch (1819-1892) astronomer

Copy of letter to C. Delaunay

See JCA's draft at 16/17/3; Delaunay's French translation at 36/18/2. Letter or extract of letter transcribed for MacAlister's biography.

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

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