The collection contains a wide range of papers relating to the activities of the Nautical Almanac Office, dating predominantly from the twentieth century. A significant part of the material concerns the production of publications, including the 'Nautical Almanac', 'Air Almanac', 'Star Almanac' 'Astronomical Ephemeris' and 'Apparent Places of Fundamental Stars'. The remaining papers include, among others, various astronomical tables, including calculations of the Sun, Moon, planets and satellites; internal papers, including material on staffing; papers on computers for the R.G.O. and on computing in general, including computer job files; and collected articles, reports and papers on various subjects. The collection contains significant correspondence, notably with the Admiralty, Hydrographer of the Navy, Royal Observatory and other observatories, including substantial domestic and overseas correspondence relating to enquiries and the exchange of data.