The horoscope of your birthday is composed of heavenly stems and earthly branches
Heavenly stems: A, B, Bing, Ding, Wuji, Geng, Xinrengui
Earthly branches: Zichou, Yinmao, Chen, Siwu, Weishen, Youxuhai
p>Among them, the Heavenly Stems: A and Yi = wood, Bing and Ding = fire, Wu and Ji = earth, Geng and Xin = gold, and Ren and Gui = water.
The earthly branches are: Zihai=water, Shenyou=gold, Siwu=fire, Yinmao=wood, Chenxu Chouwei=earth.
This is how the Five Elements were derived.