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 6 it is Yang Fire. If the year ends in 7 it is Yin Fire.
Fire is associated with the South, summer, the planet Mars. the color red, the circulatory system & heart.
Fire people are dynamic, humanitarian, energetic, passionate, enterprising, adventurous, restless, competitive, show leadership skills, are strong, single-minded, and love a good laugh.
Fire ‘Governs’ the Snake, Horse and Sheep
Here is the simple character for fire in fire