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Comments on comparison of Hansen and Delaunay's lunar tables. Suggesting co-operative work between British and American Nautical Almanac offices. MS note by Newcomb at end giving permission for confidential sections to be published. See also JCA's draft at 16/49/1). Letter or extract of letter transcribed for MacAlister's biography.

Speech proposing that Delaunay be made a foreign member of the RS.

Incomplete. See 16/17/1 for another draft of same letter. See 36/18/1 for French translation. Acknowledgement of copies of CD's replies to LeVerrier's attacks on his theory of the moon. Nature of LeVerrier, Hansen's and Plana's errors. M. de Pontecoulant's letter in Monthly Notices of RAS.

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.

See16/22/3 for another copy. Sympathy at death of Charles Delaunay.

Letter of introduction for Pierce. Plana convinced of JCA's and CD's expression of the secular acceleration of moon's mean motion. Hansen and LeVerrier might yet be convinced.

Another copy of 16/20/2. Appreciation of CD's explanation of discrepancy between value of secular acceleration of moon's mean motion, and that derived from ancient eclipses. Likely to be attacked by Pontecoulant.

Congratulations on CD's appointment as Director of the Imperial Observatory. JCA's gratification at awarding medal of RAS to CD.

Another draft for same letter at 16/14/2. See 36/16/1 for French translation, of same letter. Acknowledgement of offer of corresponding membership of [French] Academy of Sciences. Sends offprints of published papers. Description of work forthcoming. Defence of work on lunar theory against Plana.

See 36/17/3 for French translation. CD's letter verified JCA's coefficients in expression of secular acceleration of moon's mean motion. JCA has discovered error and corrected it, in his own work.