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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)
Greenwich Park (boundary wall)
Distance (S) from Greenwich
OS map detailsOS Explorer: 161 or 162
OS grid refTQ 38853.76900
(538853,176900)
WGS84 lat/long51.474031, -0.002100
TypeAstronomical
Marking date1721 (relocated 29 Jan 1743)
AccessRestricted (park opening hours). Mark no longer present