Cambridge Digital Library

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1. ▸  Collection
   • Royal Greenwich Observatory Archives (5)
2. ▸  Subject
   • ASTRONOMY (5)
   • Astronomy (5)
   • Longitude (4)
   • Nautical instruments (3)
   • Magnetism (2)
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   • Mathematics (2)
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3. ▸  Page has transcription
   • No (5)
4. ▸  Page has translation
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5. ▸  Languages
6. ▸  Date
   • 1700s C.E. (4)
   • 1800s C.E. (2)
   • 1900s C.E. (1)