1Thomas Jefferson’s Calculations of Latitude of Willis’s Mountain, 8-9 December 1816 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
2Thomas Jefferson’s Calculations of Latitude of Poplar Forest, 8 November–3 December 1816 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
3Thomas Jefferson to Wilson Cary Nicholas, 19 April 1816 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
4Thomas Jefferson to Isaac Briggs, 17 April 1816 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
5Thomas Jefferson’s Astronomical Calculations, 5-11 February 1811 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
6William Lambert to Thomas Jefferson, 24 July 1810 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
7William Lambert to Thomas Jefferson, 19 April 1810 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
8William Lambert to Thomas Jefferson, 8 December 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
9William Lambert to Thomas Jefferson, 5 December 1809 (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]
10Enclosure: William Lambert’s Table for Computing the Moon’s Motion, with Examples [ca. 19 September 1809] (Jefferson Papers)
Greenwich Observatory, England; and prime meridian [index entry]