Is it true that winter solstice is the shortest night in a year?

It is wrong to say that winter solstice is the shortest night in a year.

The winter solstice is one of the twenty-four solar terms in the China lunar calendar, representing the arrival of winter. On this day, the sun shines directly on the Tropic of Capricorn, with the shortest day and the longest night in the northern hemisphere, which is caused by the revolution of the earth around the sun.

According to modern astronomical science, during the winter solstice, the sun moves to 270 (winter solstice), and the position where the sun directly hits the ground reaches the southernmost point of the year. The sun shines 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, the winter solstice is the shortest day and the longest night in the northern hemisphere. The shorter the day, the longer the night. The winter solstice is the southernmost day of the sun in a year, and it is also the limit of the sun's southward travel.

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.

As far as Beijing is concerned, the daytime from winter to sunrise is only 9 hours and 20 minutes, and the height of the sun at noon is only 26 42'. During the winter solstice, the northern hemisphere gets the least solar radiation, about 50% less than the southern hemisphere. After the winter solstice, the stars in the night sky are completely replaced by the stars in winter. From today, they will enter the ninth. At this time, the southern hemisphere is in a hot summer.