longitude


GIS Learning

Drawing from 1812 by William Chavasse proposing an anchor system to provide a stable platform for using at telescope at sea for determining longitude based on the position of the moon and the stars. The Board of Longitude determined this method to be unworthy.

Board of Longitude Archives Opened to the Public

GIS Learning

The 300-year-old archive of the Board of Longitude has been scanned and made available to the public via the the Cambridge Digital Library.