Cambridge University Library and the Royal Observatory Greenwich have digitised the Board of Longitude archive and are now available to view online at cudl.lib.cam.ac.uk/collections/longitude.
The Board of Longitude sent astronomers on voyages of exploration to test methods of navigation and help make better maps.
This film looks at some of the techniques they used to make maps and introduces the story of William Gooch, a young astronomer who met an untimely end.
For more information please visit rmg.co.uk/boardoflongitude/
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