The meaning of summer solstice solar terms: the longest day in a year.
The summer solstice is one of the earliest solar terms among the 24 solar terms. On June 2 1 day or 22/year in the solar calendar, when the sun reaches 90 degrees of the yellow meridian, it is the summer solstice. The "solstice" means "extreme", and the summer solstice is also called "the day is long". After the summer solstice, the direct point of the sun gradually moves south, and the days in the northern hemisphere will be shorter and the nights will be longer day by day.
Zhao Zhi Heng, an expert in astronomy education in China and director of Tianjin Astronomical Society, said that on the day of the summer solstice, the whole northern hemisphere ushered in the longest day. The longest day in China is Mohe River, which is nearly 17 hours; The shortest is Zengmu shoal, with a day length of 12 hours. There is a gap of nearly 5 hours between the north and the south in China.
On the origin of summer solstice solar terms
Summer solstice, also known as "Summer Festival" and "Summer Solstice Festival" in ancient times. On the summer solstice in ancient times, people prayed for disaster and prosperity by offering sacrifices to God. "Zhou Li Chun Guan" contains: "With the arrival of summer, to local things." Sacrificing to God in the Summer Solstice of the Zhou Dynasty means clearing away plagues, famine years and death from hunger. Records of the Historical Records: "On the summer solstice, music and dance are used to worship the land." As an ancient festival, the Summer Solstice began in the Song Dynasty, and the officials had a three-day holiday. In the Liao Dynasty, the Summer Solstice was called the' Chao Festival', and women entered the colorful fans and presented their legacy with powder and fat capsules.
In the 7th century BC, the ancestors used Tugui to measure the sun's shadow, which determined the summer solstice. The annual summer solstice begins on June 2nd1day (or 22nd) and ends on July 7th (or 8th). According to the Transcript of Compliance with the Constitution: "The sun arrives in the north, the day is long, and the shadow is short, so it is called the summer solstice. To the best, to the utmost.