Question

What is a and imaginary line that goes around earth

Answer 1

longitude. the distance east or west of the Greenwich (an imaginary line fromf rom the top of the Earth to the bottom), measured in degrees and minutes. Latitude is the distance north or south of the equator. hope i could help :)

Answer 2

It's most likely the equator if you mean latitude, but there are are other imaginary lines so I'd need more details