What is the summer solstice in the 24 solar terms?

The summer solstice is the tenth of the twenty-four solar terms. The summer solstice is not only one of the 24 solar terms, but also a festival in the ancient "four seasons and eight festivals". Since ancient times, people have celebrated the harvest and offered sacrifices to their ancestors in order to pray for a good year. Like the winter solstice, the summer solstice is also a solar term reflecting the changes of the four seasons. Astronomy stipulates that the summer solstice is the beginning of summer in the northern hemisphere. After the summer solstice, the nights are getting longer and longer. However, because the heat radiated from the sun to the ground is still more than the heat radiated from the ground to the air, the temperature will continue to rise in the future, so there is a saying that it is not too hot from summer to the sun.

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 ground is heated strongly and the air convection is strong, which is easy to form thunderstorms.

The summer solstice is the northernmost day of the sun in a year, the limit of the sun's northward movement, and the longest day in the Tropic of Cancer and its northern region in the northern hemisphere. The higher the latitude, the longer the days. This is the "long day and short night effect" caused by the tilt of the earth's rotation axis, and the closer it is to two levels, the more obvious it is.

From summer to the sun, the direct position of the sun on the ground reaches the northernmost point of the year, almost directly to the Tropic of Cancer, and the daytime in the area north of the Tropic of Cancer in the northern hemisphere reaches the longest, and the farther north it is, the longer it is.