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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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LocationEngland
Hertfordshire
Nr Puckeridge
N side of: Mentley Lane West
Distance (N) from Greenwich
OS map detailsOS Explorer: 194
OS grid refTL 37606.23729
(537606,223729)
WGS84 lat/long51.895129, -0.001598
TypeMarker 'stone'
Marking date2000
AccessUnrestricted