Why are the Arctic and Antarctic circles specifically located at 6630 north and 6630 south?
The Arctic Circle is the imaginary circle on the surface of the earth at 661/2N latitude, i.e., 231/2 south of the North Pole. It marks the northernmost point at which the sun can be seen at the winter solstice (about Dec. 22) and the southernmost point of the northern polar regions at which the midnight sun is visible. The Antarctic Circle is the imaginary circle on the surface of the earth at 661/2S lat., i.e., 231/2 north of the South Pole. It marks the southernmost point at which the sun can be seen at the winter solstice (about June 22) and the northernmost point of the southern polar regions at which the midnight sun is visible.
