Scope and Contents Correspondence regarding photographic magnitudes in relation to astrographic charts:Correspondence with E.C. and W.H. Pickering of Harvard College concerning various aspects of astrographic charts and the determination of photographic magnitudes, 1909-1912, with Circular No. 150 on standard photographic magnitudes of the polar sequence and photographs of the north polar sequence stars.Correspondence with various individuals concerning photographic magnitudes, 1911, with...

Scope and Contents Correspondence relating to sunspots and prominences, 1882-1884. There are two letters from Christie to 'Nature' concerning the magnetic storm of 2 October 1882 and the great sunspot of November 1882 respectively, and a letter to 'Nature' from W. Huggins regarding the solar corona. The papers also include undated internal notes on sunspot dimensions.Correspondence with W. Huggins concerning phenomena of the solar corona and explanations thereof, 1885.Correspondence with W....

Scope and Contents (1) Lunar physicsMiscellaneous correspondence with various individuals concerning different aspects of lunar physics, 1886-1901, including changes in the appearance of lunar craters, unexplained lights, glows on the Moon's surface, the fall of meteors on the Moon's surface and possible effects on the Earth, the subject of why the Moon is addressed as 'she', and the origin of lunar mountains.(2) Planetary physicsMiscellaneous correspondence with various individuals...

Scope and Contents Correspondence of 1896-1905 concerning a proposed new comparison of theory with the Greenwich observations of the Moon from 1750. The correspondents include S. Newcomb, E.W. Turner and D. Gill.Correspondence with S. Newcomb concerning errors in the tables of Mars, 1905.Correspondence with S. Newcomb regarding comparisons of Sir George Airy's longitudes of the Moon with Hansen's tables, 1905.Mr Cowell's memoranda on gravitational calculations and empirical terms of...