Unpublished paper, 'An account of observations taken at the observatory near Fort Saint George in the East Indies for determining the obliquity of ecliptic in the months of December 1809, and June and December 1810' by Captain John Warren Warren details observations used to determine the obliquity of the ecliptic at Fort St George [Chennai, Tamil Nadu, India]. He describes the instruments used to take the observations and explains difficulties experienced in using these instruments in tropical climates. He then provides specific observations and calculations. Minor graphite annotations appear. Subject: Astronomy Written by Warren at the Honorable Company's Observatory [Chennai]. 1 February 1811