The sun moves in a circular path above our head. The Arctic is inside the circular path of the sun, while the Antarctica is outside the circular path of the sun. The outside circular path (Antarctica) makes a much bigger circle around the earth, then the inside circular path (Arctic). If you are inside or outside the circular path the sun makes, once you get far enough away from the sun, it will get dark outside, as sunlight no longer reaches you, making it cold, and water at sea level turn to a solid form, known as ice.

Two places will ice form in a circular shape. One at the centre of the earth, that be the Arctic. The other at the edge of the known earth, known as the Antarctica, which makes a much bigger ice circle.