Every human beings has anxiety about future because human doesn't know future. Therefore, a variety of methods which read people's fate have came down to descendant regardless the East and the West.
Ancient people realized changing day and night, sun and moon, seasons in certain order, according to yin and yang and five elements. In same way, people think that we could predict the fate of humanity because people have organic connection and follow changing of nature.
The YeumYang(陰陽) are two power balancing and harmonizing and causing life such as sky and ground, day and night, men and women, left and right, up and down.
The five elements are the five primary substances such as wood, fire, earth. metal, water. these change and circulate as perform the formation which save and kill each other.
wood is force of spring, fire is force of expansion and dispersion, earth is force of mediation, metal is force of gathering and water is force of compression and preservation. fortune telling inference from birthday.
The method is as follows. At first, eight letters come from birthday.
Second, the eight letters are transshaped as five elements then see relation between elements.
You can see killing and saving each element then elements transform into YukChin(六親).
According to YukChin(六親), fortuneteller knows family relations, the rich, the poor, honor, job, success and failure.
YukChin(六親) is very important to understand human condition however YukChin theory has its limit in various human life. To fill the gap, it need to know about MulSang(物象). all things have peculiar shapes and the shapes can change. we must know MulSang(物象) to predict future because omen and sign appear from this Mulsang(物象).
GanJi(干支) is to embody mark which is effected by power of sky and earth. Especially Cheongan(天干) is so important because it represents changing of nature.
If you realize this study to characteristic of Cheongan(天干), you can understand easily.
MulSang(物象) is designed to develop Myeongri(命理) because it have to predict future.