Cambridge Digital Library

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1. ▸  Collection
   • Royal Greenwich Observatory Archives (14)
2. ▸  Subject
   • Longitude (12)
   • ASTRONOMY (11)
   • Astronomy (11)
   • Marine navigation (8)
   • Tides (4)
   • Time Measuring Instruments (4)
   • Mathematics (3)
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3. ▸  Page has transcription
   • No (14)
4. ▸  Page has translation
   • No (14)
5. ▸  Languages
6. ▸  Date
   • 1800s C.E. (14)