The origin of khaki sky

Yunnan people summed up the weather phenomenon in late autumn, so it was named Huangli.

1. It takes 18 days every year from the third day before the first first frost Festival to the end of the first first frost Festival, which is a khaki day. There is a folk proverb that "the first frost is sunny, and the frost and rain are rain". The first frost festival is the best planting time for wheat, rape and broad bean in Yunnan.

2. There are four months in March, June, September and twelfth lunar month in the lunar calendar, and 10 days after the festival. These four months are Chen, Wei, Xu and Ugly, and their five elements belong to the earth, so they are called earth days.