1Enclosure: William Lambert’s Calculation of the United States Capitol’s Longitude from Greenwich, 11 July 1822 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
2Enclosure: William Lambert’s Methods of Calculating the Moon’s Parallaxes, 27–28 June 1822 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
3William Lambert to Thomas Jefferson, 18 March 1822 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
4Enclosure: Josiah Meigs and Robert King, Geometric Meteorological Chart for Washington, D.C., 1820, [by 3 May 1821] (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
5Thomas Jefferson to Bartholomew Fuller, 17 December 1819 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]