Which solar term has the longest day time and the shortest night time?

The longest day and the shortest night are the summer solstice solar terms.

The summer solstice is the 10 of the 24 solar terms. It means noon, the longitude of the sun is 90 degrees, and the solar calendar is celebrated on June 2 1 -22. On the day of summer solstice, the position where the sun shines directly on the ground reaches the northernmost part of the year, almost directly on the tropic of cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year. For the Tropic of Cancer and its northern region, the summer solstice is also the highest day at noon in a year.

The solstice in summer is the turning point of the sun's northward movement. After the summer solstice, the direct point of the sun began to move south from the Tropic of Cancer, and the days in the northern hemisphere began to shorten gradually. For China, which is located in the north of the Tropic of Cancer, after the summer solstice, the height of the noon sun begins to decrease day by day; For China, which is located in the south of the Tropic of Cancer, after the summer solstice, the height of the sun returned to the south at noon, and it began to decrease day by day after the sun shone again.

The summer solstice is in midsummer, that is, at noon, belonging to the sun; Although summer is full of yang and the daytime is the longest, it is not necessarily the hottest day of the year, so the heat near the surface is still accumulating and has not reached the maximum. After the summer solstice, the days in all parts of the northern hemisphere began to shorten gradually. There is a folk proverb that "eating noodles on the solstice in summer will shorten the day". China Tang Dynasty poet Wei's "Summer in the North Pool" also wrote that "the sundial is overcast, and the night leaks for a long time".

The custom of summer solstice:

1. Sacrifice to gods and ancestors: Summer solstice is one of the "four seasons and eight festivals". Since ancient times, people have celebrated the harvest at this time, sacrificed their ancestors and prayed for a good year. In the ancient farming society, people lived and worked in peace and contentment. They chose a day to worship the gods and ancestors, and they had various regular festivals. Abundant offerings to gods and ancestors developed into festival feasts, and gradually formed some established ways of celebration, that is, the so-called festival folk customs.

2. Cold noodles: In the summer solstice, cold noodles are commonly eaten in all parts of Shandong, commonly known as water, and there is a proverb "Winter solstice is jiaozi's summer solstice". In Laiyang area, new wheat is recommended from summer to day, and in Huangxian (now Longkou City) area, new wheat grains can be eaten when cooked. Children weave a delicate small hedge with wheat straw and fish it into their mouths again and again in soup. It is not only a game but also a game, which is very interesting for farm life.

Please refer to Baidu Encyclopedia-Summer Solstice for the above contents.