It's called the earth's axis.
The axis.
The axis.
axis of rotation
the axis
fuh
the axis
the equator
axis
The imaginary line that circles the middle of the earth is called the equator.
First of all to correct your spelling. 'Imiginary' should be 'IMAGINARY'. and 'Witch' should be 'which' There is no such word as 'imiginary' in the English language. 'Witch' is a 'female sorceress'. Please remember to correct your spelling in future. Two answer your question ; The imaginary line is the AXIS'. on the surface of the Earth it is the two poles (North and South Poles). The Earth rotates ONCE in every 24 hours.
The equator
axis