Snakes in Chinese mythology of the Han dynasty, which claimed to rule with the protection of water and the north. Although the Black Warrior (Xuan Wu) is generally depicted as a snake entwining around a turtle, sometimes they are viewed as two separable generals. In Chinese culture mythologized snakes and snakelike beings have various roles, including the calendar system, poetry, and literature. In Chinese culture, years of the Snake are sixth in the cycle, following the Dragon Years, and recur every twelfth year. The Chinese New Year does not fall on a specific date, so it is essential to check the calendar to find
Chinese calendar less than 30 days and there may be two mid-climate terms. The Shíxiàn calendar changed the mid-climate-term rule to "decides the month in sequence, except the intercalary month." The present traditional calendar follows the Shíxiàn calendar, except: To optimize the Chinese calendar, astronomers have proposed a number of changes. Gao Pingzi (; 1888-1970), a Chinese astronomer who co-founded the Purple Mountain Observatory, proposed that month numbers be calculated before the new moon and solar terms be rounded to the day. Since the intercalary month is determined by the first month without a mid-climate and the mid-climate time varies by time