Depending on where you are south of the Antarctic Circle, the period of no sunrise/ sunset may be a day or so, up to six months at the South Pole.
Your answer depends on where you are on the continent.
The only desert that would have 21 hours of sunlight would be Antarctica during the summer months.
Emperor penguins in Antarctica can go without sunlight for about two months during the winter.
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Antarctica is cold because it lacks sunlight during the winter months. Antarctica is windy based on Katabatic winds that flow downhill from the polar plateau -- about two miles high, and that are powered by the rotation of the earth.
Depending on where you are on the continent, you can experience 24 hours of sunlight each day during the summer months.
Months with no sunset can range from late October to late February -- depending on where you are on the continent.
Antarctica It is dark for six months straight before a six month period of constant sunlight. Although many say that Africa is the darkest because of high dense thick forest & sunlight may not be seen during brightest sunny days.
All countries receive sunlight to a greater or lesser extent. Depending on the time of year.
The same number of months as there are in each season anywhere on earth, about three.
During many of the summer months -- October to February -- parts of the Antarctica continent experience no sunsets.
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.