Theories and other items on the Sun, Moon and planets, including H.A.E.A. Fayé's papers on solar atmosphere; correspondence from M. Pontecoulant, J.C. Adams, P.A. Hansen and C.E. Delaunay on the Moon's secular acceleration; a printed copy of J.C. Adams' tables of the Moon's parallax; charts of the Moon's diameter from observations with the altazimuth, 1848-1859; letters from U.J.J. Le Verrier, H.A.E.A. Fayé, M. Ballot and E.C. Herrick of America on a supposed planet 'interior' to Mercury; and other correspondence on solar and lunar tables and theories.