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The Prime Meridian isn't really "marked by" anything. It is DEFINED by reference to the Royal Observatory in Greenwich, England. It is the zero point for the measurement of longitude east or west of Greenwich.

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Q: What is the prime meridian marked by?
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Related questions

The distance east or west of the prime meridian is marked by lines of what?

latitude


How are location to the left of 00.00 (the prime meridian) marked on the globe?

By a W for West


What imaginary line is located at 0 dergees longitude?

prime meridian!Prime Meridian!PRIME MERIDIAN!PrImE MeRiDiAn!


What is the another name for prime meridian?

Everywhere on Earth has a meridian, which is the line through the point and also through the north and south poles. The prime meridian marks the meridian with zero longitude. It used to be marked by a line in the ground at the Greenwich observatory in London, but in GPS coordinates the prime meridian passes about 50 metres to the east of that line now.


What is the peculiarity of 180 E or 180 W longitude?

Both of those longitudes are marked by the same meridian ... halfway around the globe from the Prime Meridian.


What is the name of the meridian that is located at 0 longitude?

This is called the Prime meridian, it passes through Greenwich, England.


The line of longitude marked o degrees on the world map from which longitude east and west are measured?

the prime meridian


What comes before meridian?

prime the prime meridian


What do you call the vertical line from north pole to south pole marked 0 degrees?

The vertical line is the Prime Meridian.


What is the name of 0 longitude?

This is the Greenwich Meridian, the Prime Meridian of the World.


What is the sixth prime meridian?

There is only a single Prime Meridian.


What is the latitude in the prime meridian?

The prime meridian is at all latitudes.