A ledger of calculations of the longitude of Madras from the Cape and from Greenwich. There are also observations of Halley's Comet, 28 October 1835 - 2 March 1836; Encke's Comet, 2-20 May 1842; the Great Comet, 5 March - 14 November 1843; Mauvais' Comet, 27 October 1844 - 10 March 1845; Wilmot's Comet, 24 April 1845 - 31 December 1847; and Gambart's Comet, 17 August 1846 - 15 February 1849. With the ledger are two small notebooks entitled '1835 Right Ascension of Centre of the Moon and Mars and mean solar times of the transit of Saturn and the Georgian' and '1835 Mean Solar Times of Transit'.