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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
LB Greenwich
Greenwich (SE10)
Crowley House (site now occupied by Greenwich Power Station)
Distance (N) from Greenwich
OS map detailsOS Explorer: 161 or 162
OS grid refTQ 38854.78175
(538854,178175)
WGS84 lat/long51.485488, -0.001585
TypeAstronomical
Marking date1762 (or earlier)
AccessNone, but site visible form Highbridge Wharf. Mark no longer present