Greenwich is an observatory in London England, assigned as the "starting point" for the time zones.
There is only one Greenwich Meridian (which I think is what you're asking about). It is the zero degrees line of longitude, so when a map location is given the longitude is given as being east or west of Greenwich. It position, going through Greenwich is partly historical and partly practical - opposite the meridian is the International Date Line, which for practical reasons is placed in the sea.
GMT=Greenwich Mean Time
Greenwich England
Since the early 20th Century, the Prime Meridian has been agreed by all nations to be the meridian that passes through Greenwich, England. It is sometimes called the Greenwich Meridian.
The international date line is a meridian. It is also known as the Greenwich Meridian .
The International Date Line (IDL) is a line of longitude located at about 180 degrees east (or west) of the Greenwich Meridian.
Nevil Maskelyne, was a British astronomer from 1765 to 1811. He put forth the concept of using the distance to the moon as a way to measure longitude. His calculations were made at the Greenwich Observatory. As a result, Greenwich was adopted as the Prime Meridian in 1884.
A meridian is an imaginary line that runs from the North Pole to the South Pole on the Earth's surface. It is used in navigation and to indicate longitude. The prime meridian, at 0 degrees longitude, passes through Greenwich, England.
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Londan
prime merdian
north and south
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tne name of the semicircle joining the poles to poles is called merdian
annaclaire accud desert
England, dummy