Antarctica is polar and the sun does not set during the summer months in either polar latitude.
The phenomenon occurs anywhere north or south of the appropriate circle, where for at least one 24-hour period there is no sunrise/ sunset.
There is night time, but there is no darkness, because the sun doesn't set. Depending on where you are south of the Antarctic Circle, you experience at least one 24-hour period of no sunrise -- or sunset -- each year. At the South Pole, there is only one sunrise and one sunset per year.
Sunrise at the South Pole is on about the 21st of September every year. Sunset is on about the 22nd of March the following year. The reverse is the case at the North Pole. So a polar day is about 6 months and a polar night is also about 6 months.
This may be true for a single point on the Antarctic continent. Every location south of the Antarctic Circle experiences at least one 24-hour period of no sunrise/ sunset. At the extreme, the South Pole experiences one sunrise/ sunset each year. The corollary is true north of the Arctic Circle.
The location on the Antarctic continent with only one sunrise and one sunset per year is the South Pole. Otherwise, south of the Antarctic Circle, geographic locations experience at least one 24-hour period without a sunrise or sunset. There is no standard for the continent, but the number of sunrises and sunsets changes given the location.
You may be thinking of periods of no sunrises. These periods vary depending on where you are on the continent, and occur between about February and November. However, at the South Pole, there is only one sunrise and one sunset per year.
No...Sunrise at the north pole is on the 18th of March, and sunrise at the south pole is on the 20th of September. The poles have only one sunrise and one sunset each year.
All latitudes north and south of the respective polar circles -- 66 degrees N and 66 degrees S -- experience at least one 24-hour period each year with no sunrise/ sunset. Because all of Antarctica is south of 60 degrees, there are long periods of no sunrise -- or sunset at the opposite time of the year. This is caused by the earth's seasonal tilt away from the sun.
Both polar locations experience only one sunrise and sunset per year.
Generally, and depending on where you are on the continent, you can experience sunshine during Spring, Summer and Fall. Closer to the Antarctic Circle, there is only one 24-hour period with no sunrise, and that day is during the Winter. Note that the South Pole experiences one sunrise/ sunset per year.
Both mark latitudes, north -- Arctic, and south -- Antarctica, of the Equator beyond which there is at least one 24-hour period of no sunrise/ sunset per year.
Antarctica is a polar environment, and there are two polar environments on Earth. Both polar environments can be marked by their respective circles of latitude, about 66 degrees -- Antarctic (S) and Arctic (N) -- beyond which there is at least one 24-hour period of no sunrise/ sunset each year. This is because seasonally, the earth tilts toward and away from the sun. At the poles, this period is six months.
Sunrise and sunset times will vary only slightly (a minute or less) from year to year for the same date. The reason is that our calendar is 365 days / year with a 366-day year every fourth year. The solar year is approximately 365 1/4 days, therefore, making our clock time just slightly different - but not noticeably. Unless you're planning something down to within seconds, you can use last year's sunrise/sunset times every year.