It is the parallel of latitude that runs 66° 33' 44" (or 66.5622°) north of the Equator.
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roughly 133 degrees
66½ºN is the Arctic Circle; 66½ºS is the Antarctic Circle.
Not sure about the artitic (sic) circle but in 2012 the Arctic Circle was approx 66.56 degrees north of the equator. It is around 66.66 degrees north but the exact value depends on the tilt of the Earth's axis which changes slightly over time.
Arctic Circle.
A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.