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Royal Observatory Greenwich
Latitude and Longitude
Airy Transit Circle (ATC)
WGS84 and the Greenwich Meridian
The Greenwich Meridian before the ATC
The Quest for Longitude
International Meridian Conference (1884)
Meridian Day (1984)
The Millennium
Millennium Tree Line (MTL)
Meridian Laser
Astronomers Royal
Telescopes used with Meridian Marks
 
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LocationEngland
LB Greenwich
Greenwich (SE10)
Royal Observatory, Flamsteed House
Distance (N) from Greenwich
OS map detailsOS Explorer: 161 or 162
OS grid refTQ 38839.77343
(538839,177343)
WGS84 lat/long51.478015, -0.002127
TypeTelescope
Marking date1721
AccessRestricted (charged entry)