It changes slightly every day, just like it does everywhere else on Earth.
On a single day, it could be anything between zero and 24 hours, depending
on the date, and exactly how far south of the Antarctic Circle you are. Over
the course of a whole year, it averages out to 12 hours for each day.
(Just like it does everywhere else on Earth.)
On December 22, all regions at or below (towards the south pole) the antarctic circle will have 24 hours of sunshine.
Twelve hours of daylight on the Antarctic continent would be a phenomenon experienced in a narrow, circular band of geography between the Antarctic Circle and the South Pole. This phenomenon would occur midway between December 21 and June 21, and again between June 21 and December 21.
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 Antarctic Circle experiences 24 hours of daylight during the summer solstice, which occurs around December 21st each year. This phenomenon happens because the South Pole is tilted toward the sun at this time, allowing for continuous sunlight. Conversely, during the winter solstice around June 21st, the region experiences 24 hours of darkness.
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.
If you experience 24 hours of daylight in the summer, you would be located in regions north of the Arctic Circle or south of the Antarctic Circle. This phenomenon is known as the midnight sun, where the sun remains visible for the entire 24 hours due to the tilt of the Earth's axis.
December 22 is close to the northern hemisphere's winter solstice (December 21), when the Sun is furthest south. At that date the Sun does not rise above the horizon at all latitudes north of the Arctic Circle (approximately 66.5 degrees north). They therefore have zero hours of daylight.
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.
Winter solstice will come for the northern hemisphere on December 21 in 2014. The region of earth that will have 24 hours of daylight is everything south of the Antarctic Circle.
On December 21, the rays of the sun strike directly on the Tropic of Capricorn, at approximately 23.5 degrees south latitude. This marks the Winter Solstice in the Northern Hemisphere and the Summer Solstice in the Southern Hemisphere.
The Arctic region, anywhere north of the Arctic Circle (approx. latitude 66° 34' N), has the greatest number of daylight hours when it is summer in the Northern Hemisphere. The Antarctic (including almost all of Antarctica), south of the Antarctic Circle (approx. latitude 66° 34' S), has the greatest number of daylight hours when it is summer in the Southern Hemisphere.
The location that has the greatest number of daylight hours in a year is the North Pole. During the summer solstice, the North Pole experiences 24 hours of continuous daylight due to the tilt of the Earth's axis.