Antarctic CircleAntarctic Circle
an imaginary circle parallel to the equator, c. 66°34? south of it
The parallel of latitude approximately 66°34&minute; south, the northern boundary of the South Frigid Zone, marking the approximate limit south of which the sun remains above the horizon all day on the summer solstice.
- (geography) The line which marks approximately the northernmost place in the Southern Hemisphere where the sun does not set on the summer solstice and does not rise on the winter solstice.