The ancients divided the sky above the equator into twelve equal parts, and Jupiter (also called the old star) walked through one equal part every year, and it took twelve years to complete a cycle. According to Jupiter's position in the sky every year, it can be divided into "ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly, ugly.
Writing methods of calligraphy and painting
The "dry branch" method used to record the year of calligraphy works. "Dry" is "heavenly stem" and "branch" is "earthly branch". The so-called "dry branch" is the abbreviation of heavenly stems and earthly branches. Ten days' work is A, B, C, D, E, G, Xin, Ren and Gui. The twelve earthly branches are Zi, Ugliness, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. When ten heavenly stems and twelve earthly branches are joined together to record the year, they become Jiazi, Ebou, Bingyin, Xinyou, Ren Xu and Guihai, with a 60-year cycle, commonly known as "Sixty-year Flower Jiazi".