That is usually known as the border.
Radcliffe line separates India and Pakistan
the equator
The imaginary line that separates the world into the western and eastern hemispheres is called the Prime Meridian. It runs vertically from the North Pole to the South Pole, passing through Greenwich, England.
the equator is the imaginary line
The imaginary lines that run from north to south are called lines of longitude. The most significant one is the international date line, which divides the extreme east from the extreme west.
The line is known as the equator. The equator divides the earth into the northern Hemisphere, and the southern hemisphere.
The line that separates the northern and southern hemispheres is called the equator.
My name is the Border of Tuesday and Wednesday. I separate the two days and provide an important delineation. I am the line between Tuesday and Wednesday. I divide the days so that they can be distinguished. I am the Border of Tuesday and Wednesday.
The imaginary line that the moon rotates on is called its axis.
The imaginary line at 0 degrees latitude is called the equator.
Line of Scrimmage
the axis