Tomb-Sweeping Day, Labor Day, Children's Day, Army Day, National Day, Reason: What is it?

China's earliest solar calendar, Guo Li Chun Guan, clearly recorded the most basic constants of the astronomical calendar of "winter and summer to Japan, spring and autumn to the moon to distinguish the four seasons". After the agricultural society, the working people found that day, month and year constituted the three elements of the calendar, and 24 solar terms was basically formed in the Qin and Han Dynasties more than 2,000 years ago. 24 solar terms integrated the knowledge of astronomy and meteorology, and arranged "Spring rain surprises spring and clear valley days, and midsummer is full of summer. In autumn, there is a ballad of "autumn cold and frost fall, winter snow and winter cold". Among them, "Qingming" ranks fifth among ballads. It is also the fifth solar term of the lunar calendar. At this time, the weather is getting warmer, and everything on the earth is revived and full of vitality. Willow branches are inserted at the door of every household to sweep the grave and go for an outing in the suburbs. There is also a saying in agricultural proverbs that "clear and busy planting millet". As a symbol of Hua Xinfeng. The flowering period of Tomb-Sweeping Day is a post-tung flower, two post-wheat flowers and three Liu Hou flowers, which fully points out the flowering period and flower species of Tomb-Sweeping Day Qi. " When I was 100 years old, I asked, "At this time, everything grows clean and bright, hence the name Qingming."