an imiginary line denoting o degrees longitude
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.
A meridian is a constant longitude circle passing at a given place. The meridian in Greenwich is also called the Prime Meridian which is set at zero longitude.
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.
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prime merdian
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north and south
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tne name of the semicircle joining the poles to poles is called merdian
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