1Thomas Jefferson to John Payne Todd, 10 October 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
2Henry A. S. Dearborn to Thomas Jefferson, 14 October 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
3Enclosure: William Lambert’s Calculation of Monticello’s Longitude from Greenwich, 14 November 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
4William Lambert to Thomas Jefferson, 14 November 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
5Thomas Jefferson to Henry A. S. Dearborn, 15 November 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
6Bishop James Madison to Thomas Jefferson, 19 November 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
7Thomas Jefferson to William Lambert, 29 December 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
8Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
astronomy; and solar observations [index entry]
9William Lambert to Thomas Jefferson, 8 January 1812 (Jefferson Papers)
astronomy; and solar observations [index entry]
10William Lambert to Thomas Jefferson, 9 January 1812 (Jefferson Papers)
astronomy; and solar observations [index entry]