The cloudy day in silver moon is the lunar calendar date.

The first month of the lunar calendar is silver moon, and the time of cloudy days is not fixed.

Silver moon is the first month of the official calendar. Silver moon's annual beginning of spring starts from beginning of spring and ends, including two solar terms, namely, beginning of spring and rain. Silver moon is the time when the sun is between 3 15 degrees and 345 degrees of the ecliptic.

There is a cloudy day every 12 days. Of course, the weather is different. And there will be one day in heavenly stems and earthly branches every 60 days, so there will be five or six same days every year.

Extended data:

In ancient China, the date of the year was recorded by the chronology of the stem and branch, that is, the cooperation of heavenly stems and earthly branches was taken as sixty flowers. Yin is one of the twelve earthly branches, and a cloudy day is the day when the earthly branches are cloudy. There are five types of Yin: C Yin, Five Yin, Geng Yin, Human Yin and Jia Yin.

The sorting rules of the dry branch day method are: the first day of Jia Zi, the second day of B Chou, the third day of C Yin ... 60 days a week. At the weekend, it starts from Jiazi Day and goes on and on.

For example, in the fourth year of the lunar calendar (1989), the first day of the first month is Ding You Day, and the second day is the Reform Day ... The first day of March is exactly 60 days, so the second day of March is Ding You Day.