1. In ancient Chinese history, the north of mountains and the south of water were called Yin.
2. Among the twelve earthly branches, Zi is the Yang water and Hai is the Yin water.
3. Zi corresponds to the rat in the zodiac. It is Yang Water, its direction is true north, and the five elements represent water. Calculated according to the twelve hours of the day, Zi hour is equivalent to 23:00 to 1:00 Beijing time.
4. Zhejiang Province is a land of yin and yang.