What does the yellow sky in Yunnan mean?

First of all, there are khaki days all year round, including spring, summer, autumn and winter. The khaki days refer to March, June and September of the lunar calendar, and about ten days after the festival. (The festival in March of the lunar calendar is Tomb-Sweeping Day, and the other three months are warm summer, cold dew and slight cold, which is equivalent to 4,710,650 in the solar calendar. On behalf of the theory of five elements, the four seasons in the earth generally have a continuous sunny and dry period before these four earth days, and it often rains after entering the earth days, that is, spring rain, summer rain and deep autumn rain, so people associate the earth days with rain, because the rain in the solar calendar 10 (full moon in the lunar calendar) has great adverse effects on people.