Ancient Chinese astronomers referred to the five major planets by the names of the element they were associated with: Venus corresponds to Metal (gold); Jupiter to Wood; Mercury to Water; Mars to Fire; Saturn to Earth.
As with most astrological systems Chinese Astrologers believed a person’s destiny could be determined by the positions of the major planets, the positions of the Sun, Moon and comets and the person’s time of birth and the corresponding zodiac birth sign.
This complex system is based upon the twelve year cycle of the orbit of Jupiter. (11.86 years in reality but who is counting?}.
The combination of 5 elements × 12 animal zodiac signs creates a 60-year cycle, which starts with the Wood Rat and ends with Water Boar.
If the year ends in 2 it is Yang Water. If the year ends in 3 it is Yin Water.
Water is associated with North, Winter,the planet Mercury, the color blue, the skeletal and excretory system & the lungs.
Water people are secretive, charming, intuitive, compassionate, sensitive, creative, flexible, compliant, eloquent and Intellectual.
Water 'Governs' the Pig, Rat, Ox
Here is the simple Chinese character for water in water.