The Twenty-four Mountain Plate was created by Yang Gong. Before Yang Gong, there were no complete twenty-four mountain plates, only eight diagrams plates and twelve branches. Although the compass of the Han Dynasty also has the marks of "Eight Diagrams", "Earthly Branches" and "Heavenly Branches", it does not divide the degrees equally, but divides the heavenly stems, eight diagrams and twelve earthly branches into three layers with different degrees. Yang Gong rearranged it, and completely distributed Bagua and heavenly stems and earthly branches on the plane, which was an epoch-making creation.
The astrolabe of the Twenty-four Mountains, or the Seventy-two Dragon Pan, was created by Yang Gong in his later years. Through long-term exploration and practice, Yang Gong found that Yin-Yang and Five Elements generally exist in all directions, and the distribution of Yin-Yang and Five Elements according to the attributes of Eight Diagrams and Five Elements is not consistent with the actual situation. It's too rough to use yin and yang dragons as dragons. Through repeated research, the twelve earthly branches and heavenly stems are matched to express the attributes of the dragon, which is called "upside down" five elements. In the "Green Capsule Austrian Language", "upside down, there are jewels on the 24 th Mountain; On the other hand, there is a fire pit on the twenty-fourth mountain, and this "upside down" refers to the seventy-two dragons in Yin Na's five lines.