When will extreme sunlight appear in the Arctic Circle?

Extreme days begin to appear in the Arctic at the vernal equinox (3.2 1), and from the vernal equinox to the summer solstice, the range of extreme days extends from the Arctic to the Arctic Circle, reaching the maximum at the summer solstice (6.22), and the Arctic Circle is completely extreme. From summer solstice to autumnal equinox, the extreme diurnal phenomenon narrows from the Arctic Circle to the North Pole, and the autumnal equinox (9.23) reaches the minimum.

Extreme daylight is the phenomenon that the sun is above the horizon of the south pole and the north pole of the earth (that is, it is daytime all day). Extreme daylight only occurs at the South Pole and the North Pole. When the extreme day appears in the South Pole, the extreme night appears in the North Pole, and vice versa. Because the earth's rotation is tilted, in summer and winter, when the earth rotates, the north pole faces the sun. No matter how the earth rotates, it always faces the sun, so there is extreme sunlight, and vice versa. The Antarctic Circle and the Arctic Circle are opposite, so there is an extreme day in the Arctic and an extreme night in the Antarctic, and vice versa. Extreme day and night only occur in summer and winter. In the summer in the northern hemisphere, the daytime in the Arctic can even last for half a year.