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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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Millennium Tree Line (MTL)
Meridian Laser
Astronomers Royal
Telescopes used with Meridian Marks
 
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Greenwich Meridian Marker; Equator