December 22 is Dongzhi (or Winter Solstice), one of the 24 solar terms of the year in the Chinese lunar calendar. In folklore, a Dongzhi Festival tradition Chinese called "Shu Jiu," or "counting nine nines," is popular. With the day of Dongzhi as the beginning, the whole winter is divided into nine nine-day periods. After nine nines, the spring will come. There is also a popular folk song among Chinese people, called "The Song of Nine Nine-days" (九九歌). It introduces some of the natural phenomena