Introduction of summer solstice in the twenty-four solar terms

1, summer solstice is one of the 24 solar terms. Every year on June 2 1 or 22 of Gregorian calendar, the sun moves to 90 degrees of the yellow meridian, which is the summer solstice. At this time, the position of the sun directly on the ground reaches the northernmost point of the year, almost directly on the Tropic of Cancer, and the sunshine time in the northern hemisphere is the longest. After the summer solstice, Yin Qi began to grow and Yang Qi began to decline.

2. "But the summer solstice is not hot" and "The summer solstice is the head of the third watch" Although the summer solstice indicates that the hot summer has arrived, it is not the hottest time. After the summer solstice, the temperature will continue to rise for some time, and about twenty or thirty days is the hottest weather.

3. The ancient Chinese divided the summer solstice into three stages: the first stage was the dissolution of antlers, the second stage was the beginning of cicada singing, and the third stage was the birth of Pinellia ternata. The summer solstice is also an important traditional folk festival-"Summer solstice festival". Folk customs include offering sacrifices to gods and ancestors, avoiding summer, eating noodles and zongzi. In summer solstice, in addition to relieving summer heat and quenching thirst, we should try our best to be calm and pay attention to sleep. The weather is hot and the metabolism of human body is accelerated, so the intensity of exercise should be moderately reduced.

4. Historical origin: Summer solstice, also known as "Summer Festival" and "Summer solstice Festival" in ancient times. In the 7th century BC, the shadow of the sun was measured by civil soil gauge, thus the summer solstice was determined. Solstice is the earliest of the 24 solar terms. The annual summer solstice begins on June 2nd1day (or 22nd) and ends on July 7th (or 8th). According to "Zunxian Manuscript", "The sun arrives in the north, the days are long and the shadows are short, so it is called the summer solstice. At best, it is excellent. " The name of the summer solstice comes from this.