How many days are the extreme day and the extreme night? What are the characteristics?

Extreme day and night range and time are:

The extreme day and night range is within 66 degrees 34 minutes north latitude of Arctic Circle and 66 degrees 34 minutes south latitude of Antarctic Circle. The Antarctic polar day lasts from September 24th to March 20th, and the Antarctic polar night lasts from March 22nd to September 22nd. The extreme day time is from March 22nd to September 22nd, and the extreme night time is from September 24th to March 20th.

Extreme day and night principle:

While the earth revolves around the sun in an elliptical orbit, it also rotates around its own oblique axis. It turns out that when the earth rotates, the earth axis forms an inclination angle of about 23.5 with its vertical line, so the earth rotates for six months, and one pole always faces the sun, which is daytime; The other pole is far from the sun, and it is all night.

This magical natural phenomenon of the North and South Poles is not found in other continents.