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The Meridian Line

The 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 website has a description of the .

  • OS Explorer maps can be purchased at the   in the


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is where East meets West at the (0° Longitude); World Time is set . Remember the new millennium started in .

Greenwich lies on the , a few minutes by rail or tube, or a short river cruise from central London.  If you want to visit Greenwich and information on visiting London, England then see .  There is the famous to visit and the .  Just down river is the which is close to

The at Greenwich is in along with the and the (on which the in Washington DC, USA is based).  For information on astronomy visit

The starts in Greenwich Park every Spring.

Greenwich has a long heritage; it was the birth place of and his daughters (Bloody Mary) and (The Virgin Queen).  All the English monarchs can be found at .

It has seen many famous visitors from through to .  This and a lot more in .

For information on all the other places in the world called Greenwich including Greenwich Village, New York City, USA then visit .

Visit the Shelf where you can buy titles old and new.

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Last revised: June 18, 2002.
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