Antarctic Circle
- the parallel of latitude 66°33' south of the equator. It marks the southernmost point at which the sun is visible on the southern winter solstice and the northernmost point at which the midnight sun can be seen on the southern summer solstice.南极圈（赤道以南, 南纬66°33'; 它标志在南半球冬至日这天可以在南极点上见到太阳, 而在南半球夏至日这天可以在北极点见到午夜的太阳）。