I got this question for history. It didn't say but I would guess maybe hemispheres. It is divided equally on that way.
The equator.
Prime meridian
half of a sphere is a hemisphere
The equator is the parallel that divides the Earth into two equal parts: the Northern Hemisphere and the Southern Hemisphere. It is an imaginary line situated halfway between the North Pole and the South Pole.
Equator (0 degrees)
hemisphere
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The equator
The imaginary line that cuts the earth into two equal parts is called the equator. It is an imaginary circle around the Earth that is equidistant from the North and South poles. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere.
The equator or any of the lines of longitude (which meet at the poles).
A line drawn anywhere around earth creates a hemisphere. There are 4 hemispheres.
The equator divides the earth into two hemispheres, northern and southern. Its latitude is 0 degrees.