At a certain time of the year south pole receive constant sunlight and the days at 24 hours long this occurs because
Earths access to the southern hemisphere toward the sun reducing the effects of day and night from earths rotation
The hole in earth Ozone moves over the south pole allowing light rays to completely penetrate the atmosphere
Earths magnetic field reverses and diverts light rays toward the Southern Hemisphere
The sun moves slightly south of earth due to a magnetic pole received from other planets