What is the date of the summer solstice?

Among the 24 solar terms in a year, the day is the longest and the night is the shortest.

Summer solstice, also known as summer season and summer solstice festival, is the 10 solar term among the 24 solar terms. Fighting means noon; The yellow meridian of the sun is 90 degrees; Gregorian calendar June 2 1-22. The summer solstice is the culmination of the sun's northward movement. On this day, the sun shines directly on the Tropic of Cancer, and then the point of direct sunlight moves south. On the day of summer solstice, the height of the noon sun is the highest in all parts of the northern hemisphere north of the Tropic of Cancer, with the longest day and the shortest night. After the summer solstice, the height of the sun decreases day by day. However, for places south of the Tropic of Cancer in the northern hemisphere, sunshine is still increasing after the summer solstice.

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. In the ancient farming society, when people lived and worked in peace and contentment, there were all kinds of regular festivals, and gradually formed some established celebration methods, which were called festival folk customs. Heaven and earth are the foundation of life, and ancestors are the foundation of class; Sacrificing ancestors 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.