what is the astronomical definition for the location of the arctic circle
The globe of the Earth showing the Arctic Circle at 66.5 degrees north of the equator. The Arctic Circle is a parallel of latitude on the Earth at approximately 66.5 degrees north from the equator. On the day of the northern summer solstice (around June 22 each year), an observer on the Arctic Circle will see the Sun above the horizon for a full 24 hours.