The origin of long summer

Long Xia established this solar term in 239 BC. During the long summer solar term, the bucket handle of the Big Dipper points to the southeast, and the longitude of the sun reaches 45. So it's called Changxia.

Among the 24 solar terms, one is long summer and the other is long summer, which means that summer is coming. So what is the origin of the long summer? Let's get to know each other.

0 1 Chang Xia said that it was the beginning of a day when summer bid farewell to spring. When the temperature rises obviously, the summer heat comes, thunderstorms increase and crops enter the peak season, people are used to taking long summer as an important solar term.

In the long summer, everything is thriving. The book "Eight Chapters of Lotus Life" written by the Ming Dynasty said: "On the day of summer dream, heaven and earth began to merge and everything was beautiful." At this time, the summer harvest crops entered the late growth stage, the winter wheat blossomed and filled, the rape was close to maturity, and the summer harvest crops were basically a foregone conclusion that year. Therefore, there is a saying in agricultural proverbs that "see summer in the long summer". Rice planting and management of other spring-sown crops have also entered a busy season. Therefore, China has always attached great importance to the long summer solar terms.

In the long summer season of 2003, only the area south of Fuzhou-Nanling line in China was the real summer of "dark trees and long days, and the balcony reflected into the pond"; And some areas in the northeast and northwest have just entered spring. According to the classification standard of modern climatology (climate average temperature) in China, the daily average temperature rises steadily to above 22℃, starting in summer.

After 2004, the long summer officially entered the rainy season, and the rainfall and rainy days increased significantly. Spring, long summer, autumn harvest and winter storage, summer is the best season for many crops to flourish, and sufficient light, suitable temperature and abundant rain provide necessary conditions for plants. Monsoon climate is the main feature of China climate. Summer is affected by the warm and humid air flow from the ocean, which is hot, humid and rainy, which is beneficial to crop growth. In summer, crops have entered a vigorous growth period.

In the book "Eight Chapters of Respect for Life" in the Ming Dynasty, it was written: "On the day of summer dreams, heaven and earth will meet, and everything is beautiful." At this time, the summer harvest crops entered the late growth stage, the winter wheat blossomed and filled, the rape was close to maturity, and the summer harvest crops were basically a foregone conclusion that year. Therefore, there is a saying in agricultural proverbs that "see summer in the long summer". Rice planting and management of other spring-sown crops have also entered a busy season. Therefore, China has always attached great importance to the long summer solar terms. According to records, during the Zhou Dynasty, on the day of long summer, the emperor personally led hundreds of civil and military officials to the suburbs to "welcome summer" and instructed Si Tuleideng and other officials to encourage farmers to work hard.