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The Arctic Circle is one of the five major circles of latitude (imaginary lines around the Earth) that are often marked on maps of the Earth. This is the parallel of latitude that (in 2000) runs 66° 33' 39" north of the Equator.
Countries which are partly within the Arctic Circle are:
- Denmark (Greenland)
- United States of America (Alaska)
- Iceland (less than 1 square kilometre)
The position of the Arctic Circle is not fixed. It directly depends on the Earth's axial tilt. The axial tilt fluctuates within a margin of 2° over a 40,000-year period, mostly due to tidal forces from the orbit of the Moon. The Arctic Circle is currently drifting northwards at a speed of about 15 m (49 ft) per year; see Circle of latitude for more information.