Both Antarctica and the Arctic have long periods of daylight followed by equally long periods of night. This is because they both lie at very high latitudes.
When the southern end of the Earth is pointing more towards the sun and giving the Southern Hemisphere its summer, the position of Antarctica means that the sun never actually sets below the horizon, but appears to circle around in the sky. No shadow is cast, which is all night actually is. At the same time, the arctic is having its long night, because the northern end is tilted so far away from the sun that the light does not reach it fully, or at all for a few weeks or months. The complete day and complete night do not last a full six months except at the absolute poles, but gradually the days lengthen a little - or shorten.
Sunsets beyond about 66 degrees S and 66 degrees N sets -- and rises -- over the course of six to eight weeks during spring and fall. Otherwise, the sun will either always be present or always be hidden.
Your answer depends on your location on the continent. At the extreme, six months at the South Pole.
Sweden is the country having six months day and six months night because it is located in the north pole. However I think that Antarctica is also having long days and long nights because it is in south pole.
During polar winters, the country that experiences no sunshine for six months is Antarctica. Areas within the Antarctic Circle are subject to continuous darkness for an extended period due to their extreme southern location.
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Antarctica experiences six months of continuous daylight during the summer and six months of darkness during the winter due to its location near the South Pole.
In Antarctica, the sun disappears below the horizon during the winter months due to the tilt of Earth's axis. This phenomenon, known as polar night, can last for up to six months in Antarctica. During this time, the sun does not rise above the horizon, leading to continuous darkness.
Not all of it -- only a tiny region near the South Pole experiences 6 months of continuous daylight followed by nearly 6 months of continuous night. The North Pole has a similar division between day and night, each lasting one half of the year. However, practically all of Antarctica experiences at least 24 hours of continuous day or night, and weeks or months of continuous day or night occur in various locations. *Because of the width of the solar disc, and refraction by the atmosphere, there are about 2 or 3 more days of daylight per year than there are of night.
All of planet earth south of the Antarctic Circle experiences at least one 24-hour period of no sunrise/ sunset annually. At the South Pole, this period is six months. In between, the periods vary according to your latitude location.
The city with six months of continuous daylight followed by six months of continuous darkness is Longyearbyen in Svalbard, Norway. This phenomenon is due to its high latitude within the Arctic Circle.
Six Months of Darkness Six Months of Light - 1997 was released on: USA: 22 September 1997 (Long Island Film Festival)
In certain parts of Alaska, some areas experience six months of continuous daylight during the summer and six months of continuous darkness during the winter due to their proximity to the Arctic Circle. This natural phenomenon is known as the Midnight Sun and Polar Night.
Six months of continuous cohabitation.