Long summer's knowledge about long summer.

1, Long Summer is the seventh of the 24 solar terms, the end of the solar calendar and the beginning of Mitsuki; The time point is between May 5th and 6th in Gregorian calendar, when the sun reaches 45 degrees of the yellow meridian. The date of the lunar calendar's long summer is not fixed, it is around the first day of April every year, because the lunar calendar is the lunar calendar. "The bucket refers to the southeast, and the dimension is long in summer. Everything grows here, hence the name Long Summer. "

2. Astronomically, Chang Xia said that bidding farewell to spring is the beginning of summer. 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.

3. The solar term "Long Summer" was established at the end of the Warring States Period (239 BC), indicating the replacement of the four seasons and the beginning of the summer of the four seasons.

As a matter of fact, according to the climatological standard, the daily average temperature rises to above 22℃ steadily, starting from summer. Before and after the long summer, only the area south of Fuzhou-Nanling line in China is really "the trees are dark in summer, and the balcony reflects the pond", while some parts of northeast and northwest have just entered spring, and the average temperature in most parts of the country is around 18 ~ 20℃. In May, Sophora japonica blooms in many places. In the long summer, everything is thriving.