What is the basis of fortune telling?

What is the reason why fortune telling is calculated? What makes you say that?

Fortune telling is a common name among the people. The academic title is prediction, and the academic study of fortune telling is called Yi Xue, also called Shu Shu. The core of this theory is the branches of Yin-Yang and Five Elements and the Eight Diagrams Yijing, and the theoretical system is complex and profound. Fortune-telling in a narrow sense is a prediction of the date of birth, while fortune-telling in a broad sense includes reading numbers, palm reading, eight diagrams and six hexagrams, Taoism, geography, geomancy and so on. Ancient divination and divination belong to fortune telling. Fortune-telling, China's prediction has a long history, and its origin can be traced back to Fu, the highest city. Then Zhou Wenwang played gossip, and fortune-telling began to improve gradually.