Beginning of Autumn, is one of the "four Li", indicating the beginning of autumn, the grain begins to mature, the harvest season has arrived. "Almanac" said: "Dou refers to the southwest dimension for the beginning of autumn, Yin meaning to kill all things, according to the autumn instruction, valley cooked also." "Said wen Jiezi" : "autumn, he valley cooked also." The change of the whole nature is a gradual process, beginning of autumn is Yang gradually harvest, Yin gradually grow, from Yang sheng gradually changed to Yin sheng turning point. As Guanzi says: "Yin qi begins to fall in autumn, so everything ends."
The 24 solar terms have "three heat", that is, minor heat, Major heat, end heat, in order respectively, the beginning of heat, heat, heat, the end of heat. "Three heat" in the middle of a "beginning of autumn" solar term, after the beginning of autumn is the end of heat (end of heat), "three heat" and "three volts" represent high temperature and very hot weather, 24 solar terms in the summer is relatively long. Long summer days are beneficial to crop growth and yield, crops should have enough growing time and heat, if the summer heat time is short, crop growth time and heat are not enough, growth and yield will be affected. The 24 solar terms are the product of ancient farming civilization, which is the reflection of farming culture to the seasons.
