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: 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]
3William Lambert to Thomas Jefferson, 24 July 1810 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
4William Lambert to Thomas Jefferson, 5 December 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
5William Lambert to Thomas Jefferson, 19 April 1810 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
6William Lambert to Thomas Jefferson, 23 July 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
7William Lambert to Thomas Jefferson, 17 September 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
8William Lambert to Thomas Jefferson, 13 June 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
9William Lambert to Thomas Jefferson, 18 March 1822 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
10William Lambert to Thomas Jefferson, 4 September 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]