Knowing your birthday is very simple. As long as you look at the five elements corresponding to heavenly stems and earthly branches in your eight characters, you will know whether your five elements are missing or weak. Of course, before that, we have to understand heavenly stems and earthly branches's five elements. The five elements correspond to ten days of dryness: wood, butyl fire, Wuji soil, gold and non-nail water. Twelve Earthly Branches and Five Elements: Purple Water, Ugly Earth, Yin Mu, Mao Mu, Chentu, Jiuhuo, Noon Fire, Untouched Earth, Jinshen, Eugene, Xu Tu and Haishui. In heavenly stems and earthly branches order, odd numbers are masculine and even numbers are feminine. For example, A belongs to Yang wood and B belongs to Yin wood. Children belong to yang water, and the sea belongs to yin water.
It is not enough to understand heavenly stems and earthly branches's five elements. Why? Because there are heavenly stems hidden in the underground branches, many people who don't understand are not very clear about the five elements. In the case of earthly branches, water is hidden inside, and ugliness is the same. Yin zang meets propane, and there is wood in the grass. There are pentyl groups in aged ethyl wood and heptyl gold. In the afternoon, Zang merged with his own soil, but he didn't add Ding to Ermu. God's hiding in our soil is more beneficial to benevolence, especially in Feng Long, the capital of Jin Xin. Jin Xin and Ding E are hiding, and there is no water in the sea.
Generally speaking, if there is no corresponding five elements in the earthly branch, we can finally judge what is missing in this eight-character five elements. But it doesn't mean that what the five elements lack must be supplemented, and it needs to be combined with the whole eight characters. Of course, this requires a deeper understanding of the eight-character numerology.