What will happen in the Arctic Circle from winter solstice to Sunday?

During the winter solstice, the polar night appears in the Arctic Circle.

Extreme night, also known as eternal night, is the phenomenon that the sun is below the horizon in a day in the polar regions of the earth, that is, the night lasts for 24 hours. If the direct point of the sun is in the northern hemisphere, the polar circle in the southern hemisphere will appear polar night. The range of the polar sun is related to the latitude of the sun's direct point, and the latitude difference between the pole and the polar circle is the latitude of the sun's direct point.

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; After the summer solstice, the polar night range near the South Pole gradually narrowed, and it narrowed to zero 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.

Extreme night principle

If you leave the South Pole, the lower the latitude, it will no longer be a half-year day or a half-year night, and the time of extreme day and night will gradually shorten. At 80 south latitude, the alternation of day and night within 24 hours of 1 day only occurs outside the extreme value of day and night.

If you are at the end of the extreme day, at first, the night time is very short, then the night time is getting longer and longer, until the end, it is night, and the extreme night begins. In the Antarctic circle, only one day in a year is daytime and one day is night.

China Antarctic Great Wall Station is located outside the Antarctic circle. At one or two o'clock in the middle of the night in June+February, 5438, it was still bright, and people with good eyesight could still read and write. This extreme natural phenomenon of day and night also appears at the other pole of the earth, but at the opposite time to the South Pole. If the North Pole is in extreme daylight, the South Pole is in extreme night, and vice versa.

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