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Hansen, Peter Andreas (1795-1874) astronomer
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Copy of letter to W.H.M. Christie

Knobel's Table of comparisons of Greenwich Observations and Hansen's tables. Letter or extract of letter transcribed for quotation in MacAlister's biography. Possible that this particular item is JCA's own file copy.

Adams, John Couch (1819-1892) astronomer

Autograph letter signed to J.C. Adams

Publication of Lunar comparisons. Transcribes letter from Mr. Marth on comparison of Hansen's with Greenwich Observations. Probably sent to JCA by WHMC: see 6/14/1.

Knobel, Edward Ball (1841-1930) chemist and astronomer

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

Typed copy of letter to S. Newcomb

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.

Adams, John Couch (1819-1892) astronomer

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