The Greenwich Meridian

…where east meets west

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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)

The Millennium

Millennium Tree Line (MTL)

Meridian Laser

Astronomers Royal

Telescopes used with Meridian Marks

Coordinate Systems

Useful Links

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