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The Meridian LineThe Zero Line of Longitude (Prime Meridian of the World)What is the Meridian Line?The Meridian Line is an imaginary line which runs from the North Pole to the South Pole. By international convention it runs through "the primary transit" instrument (main telescope) at the Royal Observatory in Greenwich. It is known at Zero Longitude and it is the line from which all other lines of longitude are measured. This includes the line that runs 180° away from Greenwich also known as the International Date Line. There have been many meridian lines during the course of history including 9 lines at Greenwich! The Ordnance Survey maps started in England before the current meridian line was defined. New editions of the Explorer series maps do feature the Greenwich Meridian Line. The Ordnance Survey website has a description of the history of meridian lines.
Do you live on The Prime Meridian?
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