What does 29 days mean?

Twenty-nine days refers to the second nine days starting from the winter solstice. Generally, March 9 and April 9 are the coldest times of the year. Winter solstice, also known as solstice, winter festival, child year, etc. It has both natural and humanistic connotations. It is not only an important solar term among the 24 solar terms, but also a traditional folk ancestor worship festival in China.

Calculation method:

From the solstice of winter to the unhealed day of winter (after the winter, the first unhealed day is called "Jiaojiu", which means the beginning of cold), every nine days is a "nine", the first nine days are called "Yijiu", the last nine days are called "Erjiu", and so on, until "Jiujiu" and "Jin Jiu Peach Blossom", the weather will be warm.

As the saying goes, "Summer solstice is three years old, and winter solstice is nine years old." . It is generally the coldest in April and September, which is the coldest period of the year; By the ninth five-year plan, the cold had disappeared and spring was blooming.

The correct algorithm of "counting nine" begins from winter to the first nonunion day in the future. Therefore, the specific date of "September" every year is not fixed, depending on the first nonyl day after the winter solstice.

Another mistake is that the number nine is counted from the date of winter solstice, so the specific time of nine is fixed every year from the date of winter solstice, and each nine is fixed on the ninth day, 18 and the 27th day after winter solstice. The algorithm of counting nine from winter to day is wrong.