How long will the extreme day last in a year?

The specific time of extreme day and night

Lunar solar terms

If the direct point of the sun is in which hemisphere, then there will be an extreme night near the polar region of the other hemisphere. Therefore, after the vernal equinox, there will be an extreme night near the South Pole, and then the scope of the extreme night will become larger and larger; It reaches its maximum in summer solstice, and the boundary reaches the Antarctic circle; From summer to the future, the polar night range near the Antarctic gradually narrows, and it narrows to 0 by the autumn equinox; After the autumnal equinox, the polar night appeared near the North Pole, and then the polar night range near the North Pole became larger and larger. The winter solstice reaches its maximum and the boundary reaches the Arctic Circle. After the winter solstice, the polar night range near the North Pole gradually shrinks to zero at the vernal equinox. This cycle is repeated, and its cycle is a tropical year.

solar calendar

From March 2 1 day to September 23, extreme days appeared in the Arctic and extreme nights appeared in the Antarctic.

From September 23rd to March 2nd of the following year1day, extreme days appeared in Antarctica and extreme nights appeared in the Arctic.

On June 22nd, there was an extreme day in the Arctic Circle and an extreme night in the Antarctic Circle.

12 On February 22nd, there was an extreme day in the Antarctic circle and an extreme night in the Arctic circle.