Royal Observatory, Greenwich
He was to "apply himself with the most exact care and diligence to the rectifying of the tables of the motions of the heavens, and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting of the art of navigation".
The Greenwich Meridian runs through the site of the Observatory. It is the line at which the longitude is defined as 0°.
- HM Nautical Almanac Office Archived 2007-06-30 at the Wayback Machine
- The Royal Observatory, Greenwich Archived 1999-04-20 at the Wayback Machine
- Aerial View of The Royal Observatory, Greenwich at Google Maps
- The National Maritime Museum Archived 2011-12-12 at the Wayback Machine
- The RGO at Herstmonceux Archived 2008-12-05 at the Wayback Machine
- The Observatory Science Centre
- Isaac Newton Group of Telescopes Archived 2015-07-29 at the Wayback Machine
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