What does summer solstice mean?

Summer solstice means: hot summer is coming.

The summer solstice is the 10 of the 24 solar terms. Fighting means noon; The yellow meridian of the sun is 90 degrees; June 2 1~22 of Gregorian calendar. 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 to 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.

Historical origin:

"Twenty-four solar terms" is the product of ancient farming civilization. People have discovered the changes of the four seasons in nature, and gradually realized that the changes of climate and phenology in a year have laws to follow. Observing the Big Dipper at dusk every day, people find that the orientation of the Big Dipper is different from that of bucket handle in different seasons.

Therefore, the Big Dipper has long been a constellation indicating seasons. For example, "Guanzi Cycle" wrote: "bucket handle refers to the east, and the world is spring; Bucket handle guide, the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and it is winter in the world. " Twenty-four solar terms are special festivals in the calendar to express natural rhythm changes and establish "December construction".

Four years old, three months in spring, summer, autumn and winter, two solar terms each month, each solar term has its own unique meaning.