/kloc-when does 0/929 start?

202 1 September starts from 65438+February 21,and February 29th starts from 65438+February 30th.

Counting to nine is one of the popular customs in China. Counting nine means counting from the date of winter solstice (also known as counting from winter solstice), counting nine every nine days, and so on. As the saying goes, "it's hot in three days, cold in four or nine days", and the coldest period in a year is "three or nine days".

The number nine is calculated from the day of the winter solstice every year, and every nine days is a unit. In China, the lunar calendar uses "99" to calculate the seasons. The winter solstice is the first day of "99", and every nine days is called "99", the first nine days are called "99", the last nine days are called "29", and so on. "99" 81days later, winter ends and spring enters.

The origin of the number nine

Jiujiu, also known as Winter Jiujiu, is a folk solar term of the Han nationality. The number 9 begins with the "winter solstice" in the 24 solar terms of the lunar calendar every year. When did the custom of counting nine first originate? There is no exact news yet. But it was popular in the Southern and Northern Dynasties. "Liang Chao Shu Jing Chu Chun Qiu" records: "The winter solstice is 998 1 day, which is the end of cold."

Count nine cold days, that is, from the solstice of winter, count a "nine" every nine days until the "99" of 81 days, and the weather will warm up. According to the Chronicle of Yanjing, "March 9 to Sunday is a difficult winter." It means that it has entered the coldest stage in cold weather since March 9.