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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)
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Telescopes used with Meridian Marks
 
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LocationEngland
East Yorkshire
Sunk Island
Welwick Bank (marine embankment)
Distance (N) from Greenwich
OS map detailsOS Explorer: 292
OS grid refTA 32192.18339
(532192,418339)
WGS84 lat/long53.644865, -0.001723
TypeObelisk/Pillar
Marking date2006
AccessUnrestricted