It is unclear when the exact beginning of the New Year celebration in China is. Normally, it was said to start from the year end religious ceremony during the Shang Dynasty (1766 BC - 1122 BC). A few believe that it started from as early as Emperor Yao and Shun (~2300 BC). At the beginning, the date of celebration varied from mid-winter to early spring. With the maturity of the solar base calendar, Emperor Wu (157 BC - 87 BC) of the Han Dynasty (206 BC - 220), established the first day of the first month as the beginning of the year, where it remains. The following is a brief list: