the Prime Meridian or Greenwich Meridian and runs through Greenwich England
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You're probably thinking of the Prime Meridian, but the Prime Meridian doesn't circle the Earth; it only covers half of the Earth. The other half of the circle is the "anti-meridian" at longitude 180 degrees. (East or west? Both, and neither.)
Lines of longitude are imaginary vertical lines that represent the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime Meridian (Greenwich). Lines of longitude are often referred to as meridians. The lines of longitude run from the North pole to the South pole and at the poles all the lines of longitude intersect at a single point.
The imaginary line at zero degrees longitude is the Prime Meridian. The imaginary line halfway between the poles is the Equator. The Equator is zero degrees latitude.
Tropic of Cancer
The imaginary line that divides the Earth into the northern hemisphere and the southern hemisphere is called the equator. It is an imaginary line located at 0 degrees latitude and circles the Earth, dividing it into two equal halves. It is used as a reference point for navigation and to determine climatic zones.
This imaginary circle is called the prime meridian. it is an imaginary line that circles the globe vertically and is typically measured as beginning in Greenwich, England.
They are circles. We measure circles in degrees.
Lines of longitude are imaginary vertical lines that represent the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime Meridian (Greenwich). Lines of longitude are often referred to as meridians. The lines of longitude run from the North pole to the South pole and at the poles all the lines of longitude intersect at a single point.
0 degrees longitude = the Greenwich Meridian and international date line 0 degrees latitude = the Equator.
Equator
The imaginary line at zero degrees longitude is the Prime Meridian. The imaginary line halfway between the poles is the Equator. The Equator is zero degrees latitude.
The Prime Meridian
The prime meridian.
It is the Prime Meridian
The Prime Meridian.
The Prime Meridian.
That's the 'Prime Meridian'.
Tropic of Cancer