This meridian passes through Greenwich, London, England and is therefore called the Greenwich meridian.
Greenwhich
greenwich
That is the Prime Meridian, and it runs through Greenwich England.
The Prime Meridian
Greenwich
0 longitude is the prime meridian. 0 latitude is the equator.
It is the "Prime Meridian" or the "0 degree Meridian" which is the basis for calculating time in most of the world.
The zero meridian is a line more than 12,000 miles long, between the north and south poles. There are literally trillions of places on it. The line is called the "Prime Meridian".
The name of the meridian that is labeled 0 is the Prime Meridian.
Points on that meridian are called freezing points, especially where it crosses water.
In terms of geography, 0 degrees longitude is known as the Prime Meridian. 0 degrees latitude is the equator.
It does not get its name from a country, it gets it name from a place in London, England called "Greenwich" which was/is the sight of the great Navel observatory where the work on defining the meridian was undertaken. Of course continental drift means that the current position of the meridian is now slightly to the west of where it was marked in the ground originally (by about 100 m).