I'm not positive, but I think it's the June Solstice.
Northern
The Antarctic Circle -- about 66 degrees S -- marks the latitude beyond which the geography experiences at least one 24-hour period of no sunrise or sunset annually. At the South Pole -- 90 degrees S, this period is six months of no sunrises or sunsets.
It is one 24 hour period of no sunrise at the Antarctic Circle, when the Arctic Circle experiences the same period of no sunset.
Never.The Antarctic Circle marks the latitude on planet earth south of which at least one 24-hour period has no sunrise or no sunset.All latitudes north of the Antarctic Circle experience one sunrise and one sunset each day...until the latitude of the Arctic Circle, where the reverse occurs.
North of the Arctic Circle and south of the Antarctic one, the periods of daylight and darkness both vary from zero to six months, during the course of a year.
The Antarctic Circle is a line of latitude -- about 66 degrees S -- beyond which the geography experiences at least one 24-hour period of no sunrise/ sunset per year.
The Antarctic Circle
the tilt of the earth's axis
This phenomenon occurs because the Earth tilts away from the sun, and this is the day where the extent of that phenomenon is shortest: one 24-hour period.
The Southern Hemisphere experiences summer when it's winter in the Northern Hemisphere.
Yes, there is an Antarctic Circle.
Antarctic Circle