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The ArticCircle is one of the two polar circles, and the northernmost of the five major circles of latitude as shown on maps of Earth currently, 23 September 2025,at about 66° 34' N.Its southern counterpart is the AntarcticCircle. The ArcticCircle marks the southernmost latitude at which, on the winter solstice in the Northern Hemisphere, the Sun does not rise all day, and on the Northern Hemisphere's summer solstice, the Sun does not set.Its latitude depends on Earth's axial tilt, which fluctuates by a margin of some 2° over a 41,000-year period, due to tidal forces resulting from the orbit of the Moon [Wikipedia]
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