There are two -- the Prime Meridian -- 0 degrees, and the International Date Line -- 180 degrees.
The imaginary line through Earth's poles is called the axis. It is an imaginary line that Earth rotates around.
The imaginary line between the poles of the Earth around which the Earth spins is called the "axis of rotation".
The imaginary line between the poles of the Earth around which the Earth spins is called the "axis of rotation".
The imaginary line circling Earth halfway between the poles is called the Equator. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere. The Equator has a latitude of 0 degrees.
the equator
the Equator
the Equator
The imaginary line passing through the center of the Earth between the North and South Poles, around which the Earth rotates, is called the Earth's axis.
the Equator
That's the Equator.
International Date Line
Possibly you mean The Equator, which is the imaginary line which runs round the Earth halfway between the poles.