When is the longest day and the shortest night in a year in the northern hemisphere?

In the northern hemisphere, the shortest day and the longest night are winter solstice, which is 65438+February 2 1 or 22 or 23 every year. On the solstice of winter, the sun shines directly on the ground and reaches the southernmost tip of the year. The sun is almost directly on the tropic of Capricorn (also known as the winter solstice daily line), and the sun is most biased towards the northern hemisphere. Therefore, in all parts of the northern hemisphere, the winter solstice is the shortest day in a year, and the farther north, the shorter the day.

North of the Arctic Circle, the sun is below the horizon all day, which is the widest day of the year in the northern hemisphere. For all parts of the northern hemisphere, the winter solstice is also the day with the lowest sun height at noon all year round. During the winter solstice, the northern hemisphere gets the least solar radiation, about 50% less than the southern hemisphere.

Extended data In winter solstice, the direct point of the sun is on the tropic of Capricorn, then it moves northward and returns to the equator in spring solstice. This repeated regression movement, with a period of 5: 48: 46 on 365, is called the tropic year. North of the Arctic Circle, the sun is below the horizon all day, which is the widest day of the year in the northern hemisphere. For all parts of the northern hemisphere, the winter solstice is also the day with the lowest sun height at noon all year round.

Equinox: March 20-22 in Gregorian calendar. The sun shines directly on the equator.

Summer solstice: June 2, Gregorian calendar1-22. The sun shines directly on the Tropic of Cancer.

Autumnal equinox: September 22nd to 24th in Gregorian calendar. The sun shines directly on the equator.

Winter solstice: Gregorian calendar 65438+February 2 1-23. The sun shines directly on the tropic of Capricorn.

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