the 'boobie-sucker' line
You're thinking of the Equator.
The equator is a line of latitude that circles the Earth at 0 degrees. It is halfway between the North and South Poles, dividing the Earth into the Northern and Southern Hemispheres.
Look at a globe. The Arctic Circle surrounds the North Pole at the top of it, the South Pole is at the bottom. The equator circles the globe halfway between the two. Whichever way you read it, the Arctic Circle is closer to the equator than the South Pole is, and the Arctic Circle is closer to the equator than it is to the South Pole.
The latitude line that circles the globe at the exact midpoint between the North and South pole is known as the equator. It is located at 0 degrees latitude and divides the Earth into the Northern Hemisphere and the Southern Hemisphere. The equator is approximately 40,075 kilometers (24,901 miles) long.
It circles the Earth south of the equator.
Parallels are imaginary circles around the globe that measure latitude, which is the distance north or south of the equator. They help in locating positions on the Earth's surface and are often used as reference points in navigation and mapping.
That half of the globe 'below', or south of the equator.
That half of the globe 'below', or south of the equator.
South of the equator
The Equator.
There is no Pacific circle, the Arctic and Antarctic circles are north and south of the equator respectively
There is no America circle, the arctic and antarctic circles are north and south of the equator respectively