Why is "April 9th" after beginning of winter the solstice?

"April 9" means entering the cold weather from winter to the future, and the fourth nine days are called "April 9".

Enter "No.9" from the date of winter solstice. "Counting Nine" is a folk solar term in winter in China.

From winter solstice to Sunday, it is called "Jiujiu", every nine days, the first nine days, the last nine days, and so on, until the ninth nine days, the number reaches 998 1 day.

Extended data:

Winter solstice is one of the earliest solar terms in China, which was called "short day" or "short day" in ancient times, and the time was basically between 65438+February 2 1 day and 22 days in the solar calendar every year. 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.