The longest daylight solar term in the north temperate zone.

The solstice in summer is the longest day and the shortest night in the northern hemisphere.

Summer solstice, also known as "summer solstice" and "summer solstice festival" in ancient times. The ancients said: "The days are long, the shadows are short and extremely extreme, so it is called the summer solstice." When the sun moves to the longitude of the Yellow River at 90 degrees, it is the intersection of the summer solstice, usually on June 2 1 ~ 22 of the Gregorian calendar. On the solstice of summer, the sun shines directly on the Tropic of Cancer. At this time, the daytime in all parts of the northern hemisphere reaches the longest in the whole year, and the higher the latitude, the longer the daytime. For the Tropic of Cancer and its northern area, the summer solstice is also the highest day of the year at noon.

The summer solstice is not only one of the 24 solar terms, but also a festival in the ancient folk "four seasons and eight festivals". Since ancient times, there has been a custom of offering sacrifices to gods and ancestors to the Japanese. "Heaven and earth are the foundation of life; Ancestors are the foundation of class. " Heaven and earth are the foundation of life, ancestors are the foundation of life, and ancestor worship is the custom of inheriting filial piety. In addition, there are folk customs such as "avoiding summer and hiding" and "clearing the field" from summer to Japanese.

Extended data

Summer is the longest sunshine season in the northern hemisphere, and there will be extreme days in the Arctic Circle, and the sun will not set all day. Around July 4, the earth will move to the farthest point of its orbit. The summer solstice is the day when the sun is in the highest position in the sky. There is a folk saying that "the summer solstice is born in the shade". In fact, strictly speaking, "solar terms" reflect the laws of seasons, phenology and climate changes, while "Yin-Yang and Five Elements" belong to the category of "dry branches", and the growth and decline of "Yin-Yang" is based on "dry branches".

The summer solstice is in midsummer, that is, at noon, belonging to the sun. There is no doubt that the sun shines on the summer solstice, but the sun does not necessarily shine in the afternoon. The specific day when the sun shines is calculated according to the stem and branch. Although the summer solstice has the longest day and the highest sun angle, it is not the hottest time of the year. Because, close to the surface of the heat, at this time still continue to save, did not reach the maximum time. As the saying goes, "it's hot in dog days." The real high temperature weather is from mid-July to mid-August in Gregorian calendar (around beginning of autumn), with the highest temperature in all parts of the country.