Antarctic CircleAntarctic Circle
an imaginary circle parallel to the equator, c. 66°34? south of it
The parallel of latitude approximately 66°33&minute; south. It forms the boundary between the South Temperate and South Frigid zones.
- (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.