Cambridge Digital Library

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1. ▾ Collection
   • Darwin-Hooker Letters (1)
   • National Maritime Museum Manuscripts (2)
   • Papers of the Board of Longitude (18)
   • Royal Greenwich Observatory Archives (20)
2. ▾ Subject
   • Astronomy (19)
   • Longitude (14)
   • Geographical exploration (9)
   • Marine navigation (9)
   • Navigational aids (6)
   • Discoveries in geography (5)
   • Navigation (5)
   • Time Measuring Instruments (4)
   • Nautical instruments (3)
   • Aids to navigation (1)
   • Magnetism (1)
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3. ▾ Date
   • 1700s C.E. (16)
   • 1800s C.E. (10)