Why is the South Pole called the sunniest place on Earth?

Answer 1

it is not, but south pole does get alot of sunlight because the sun never sets during the summer time (which is half a year) and the sun never shows up during the other half.

Another Answer

The sun rises at the South Pole on about September 21 and sets on about March 21, so for six months, there are no sunsets. This period spans both spring and summer.

The North Pole experiences the same phenomenon, at opposite times of the year.
The South Pole is no more or less sunny than the North Pole, both of which experience about six months of sun every year -- with one sunrise and one set annually.

Answer 2

The South Pole is considered one of the sunniest places on Earth because it experiences six months of continuous daylight during the Southern Hemisphere's summer. This is due to the tilt of the Earth's axis and its orbit around the sun, leading to extended periods of sunlight in polar regions.