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Hansen, Peter Andreas (1795-1874) astronomer
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Autograph letter signed to A. Cayley

Acknowledgement of paper on Hansen's theory. AC's treatment of Lunar theory by method of variation of elements is new; outlines the possible difficulties. JCA is applying this method to the secular inequalities of the moon's mean motion, further to paper in PTRS, 1853.

Adams, John Couch (1819-1892) astronomer

Autograph copy of letter to G.B. Airy

Letter from Hansen to G.B.A. in Monthly Notices R.A.S. Nov. 8 1861. Hansen's memoir on the perturbations of the small planets: where he is wrong; where the translation is at fault.

Adams, John Couch (1819-1892) astronomer

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