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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
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International Meridian Conference (1884)
Meridian Day (1984)
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Telescopes used with Meridian Marks
 
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LocationEngland
Hertfordshire
Colliers End
S side of: Dowsetts Lane (bridge over A10)
Distance (N) from Greenwich
OS map detailsOS Explorer: 194
OS grid refTL 37665.21240
(537665,221240)
WGS84 lat/long51.872750, -0.001733
TypeMarker 'stone' | Pavement (plate)
Marking date2000 (reset c. 2004)
AccessUnrestricted