Related knowledge 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. Summer solstice was also called "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).