When did the three or nine days start?

Sanjiu begins on the day 19 of the solstice.

On the solstice after beginning of winter, "counting nine", commonly known as "crossing nine", means entering the coldest season of the year. The so-called "number nine" means that from the date of the "winter solstice", nine days is a unit, which is called "nine". After nine "nines", it is exactly 8 1 day, which is called "nine". From "September 19th" to "September 9th", the cold winter turned into a warm spring. Among them, March 9 is the coldest.

Extended data:

99 solar terms song:

1929 did not shoot; Walking on the ice in 3949; May 9, June 9, see the willows by the river; On July 9, the frozen river opened; On August 9, Yan returned; On September 9th, I added19; I plow cattle everywhere.

On the solstice of winter, the sun shines almost directly on the tropic of Capricorn, with the shortest day and the longest night in the northern hemisphere. After this day, the sun gradually moves northward, and the days will get longer and longer.

The winter solstice is not only an important solar term in the China lunar calendar, but also an important traditional festival of the Chinese nation. Ancient people thought that the solar terms from the winter solstice were the starting point for calculating the 24 solar terms in China.

There is a saying among the people that the solstice in winter is as big as a year. In Shang Dynasty, Zhou Dynasty and Qin Dynasty, the winter solstice was designated as "the first year of the year"-New Year. The Han Dynasty began to designate it as a festival-Winter Festival. Eating mutton in the winter of solstice is a habit handed down from the Han Dynasty.

People's Daily Online-There are as many years as there are winter solstice.

People's Daily Online-Today, the solstice winter begins.