The legend of the stems and branches dates from the Huangdi era. In fact, it sprouted in the early Western Han Dynasty, first became popular in Wang Mang, and became popular after the Eastern Han Dynasty. Some people think that before Emperor Wu of the Han Dynasty, China used stems and branches to mark the year. However, this is the Tai Sui year. The Tai Sui year is used to calculate the year. The stems and branches represent the twelve celestial bodies (the zodiac is divided into twelve equal parts). Jupiter orbits the sky once in 11.862 years, so Tai Sui goes through one more Chen in about 86 years, which is called "Super Chen". At this time, the zodiac calendar was also used. In the Zhuanxu calendar, in the first year of Taichu (104 BC) of Emperor Wu of the Western Han Dynasty, Tai Sui was in Bingzi, and the Taichu calendar was changed to Ding Chou using the Chaochen method. At the end of Emperor Cheng of the Han Dynasty, the Santong Calendar revised by Liu Xin changed the first year of Taichu to Bingzi, and the second year of Taishi (95 BC) from Yiyou to Bingxu. From this we can see that there was some confusion between the chronology of the stems and branches during the Western Han Dynasty and the conversion of the chronology of Tai Sui. By the Eastern Han Dynasty, calendar scholars did not use the Chaochen method. Therefore, the Tai Sui chronology and the Ganzhi chronology appear to be the same in the second year of Taishi. In the second year of Yuanhe (AD 85) of Emperor Zhang of the Han Dynasty, the imperial court ordered the implementation of the Ganzhi calendar throughout the country. From then on, the chronology of the stems and branches was fixed, and it has continued to this day without any confusion. However, it is said that the expression of using heavenly stems and earthly branches to record dates began in the Huangdi period. Fragments of the Sixty Years Table were discovered in the Shang Dynasty archeology at Yin Ruins.