Guyu is the last solar term of spring, marking the end of the cold wave and the temperature gradually warming.
1. Origin
According to the "Huainanzi" (Tianwen Xun) record: "(Cangjie) is the Yellow Emperor's words, the people can be reasoned, and the sky is the rain valley." ”
It means that after Cangjie succeeded in making words, the people understood the truth with words, and God rewarded the scene of millet rain. Millet rain means grain rain.
Folklore is more detailed, saying that Cangjie served as a historian during the Yellow Emperor's reign and was rewarded by the Emperor for his invention of writing, and the Emperor ordered the granary of the Heavenly Palace to be opened and rain of grain to comfort Cangjie's exploits. Later, people set this day as the Guyu solar term to commemorate Cangjie's achievements.
2. Meteorology
In ancient times, the valley rain was divided into three phases: the first was the beginning of the duckweed, and the duckweed began to grow;The second whisker flicks its feathers, and the cuckoo reminds people to sow seeds;The third candidate Dai Ren descended to the mulberry, and a hoopoe bird appeared on the mulberry tree.
In fact, from a meteorological point of view, the westerly jet in the upper East Asia weakens and moves northward, and the warm and humid air mass in South China is active, especially in the Yangtze-Huai region.
Therefore, modern cotton farmers take the grain rain festival as a cotton sowing index, and there is a proverb that "before the grain rain, it is good to plant cotton". In addition, weather proverbs during the valley rain mostly revolve around the center of rain and no rain, such as "the valley rain is gloomy and gloomy, and the rain is drenched in the beginning of summer".
* From the Internet, invaded and deleted.