That's a line that joins the north and south poles, called the Prime Meridian.
The imaginary longitude 0 is called the Prime Meridian. It serves as the starting point for measuring longitude and is located in Greenwich, London, UK.
The name of the line that has 0 longitude is the prime meridian
Prime Meridian. 180 longitude is the Iinternational Date Line, and the equator is 0 degrees latitude
They are also called Meridians.
meridians
they call parells
name all the continents found at longitude
The name of the 0 longitude is the Prime Meridian. It serves as the starting point for measuring longitude and separates the Eastern and Western Hemispheres.
Prime Meridian
prime meridrian
0 longitude is the prime meridian. 0 latitude is the equator.
The Prime Meridian itself is defined as zero longitude. (0°) You can't get any closer to it than that. The higher the number of degrees of longitude, the farther a given longitude is from the prime meridian. The maximum is 180° either east or west. There is no minimum. Whatever longitude you name, no matter how close it is to the Prime Meridian, I can always name one that's closer to it than yours is. It's like asking "What is the smallest number ?" There's no such thing.