The equator - or the prime meridian.
great circle
it is important because it divides earth into 2 equal halves.
prime merideane and equator The equator divides the earth into two equal halves.
i am pretty sure the equator
equator
The Equator...
Equator
The imaginary line that divides the Earth into two halves is called the Equator.
equator
The equator divides the earth between the Northern Hemisphere and the Southern Hemisphere
a line
A cut through any great circle does.