66.5622 degrees south
From EoEarth: "As of 2000, it lies at latitude 66° 33′ 39″ south of the equator."
You are one degree out, The Antarctic Circles latitude is 66° 33′ 39″ (or 66.56083°) south.
The area that lies south of the Antarctic Circle is called the Antarctic. The zone north is the Southern Temperate Zone. The Arctic Circle is where the equivalent line of latitude lies in the northern hemisphere.
As of December 28, 2015, you can find the Antarctic Circle at 66.5628° S. Due to earth's rotational vagaries, this line of latitude moves about 15 metres or 49 feet per year.
The Antarctic Circle is about 66 degrees S.
Antarctic
The Antarctic Circle is the collection of all the points on earth that are 23.5 degreessouth of the equator ... 23.5 degrees south latitude.
Any GPS latitude indicator south of 66° 33′ 39″ S is considered a latitude within the Antarctic Circle.
You can find the Antarctic Circle at about 66.5628° S. Because the earth wobbles, the circle moves with it.
66°33'44"
That's close to an approximate latitude for the Antarctic Circle.
Roughly 66.5 degrees south latitude.