How do the mountains and rivers on the surface correspond to the stars in the sky?

Zhouyi said, "Yi is based on heaven and earth." With the further development of geographical concept, the mountains and rivers on the surface correspond to the stars in different positions in the sky. For example, there is a black dragon in the east of heaven for nine days, which is called heaven; Here is Dongyue. In the north of the sky, there is Xuanwu as the mysterious sky, and there is Beiyue below it. There are suzaku in the sky and Nanyue in the ground, all of which are sunny. There is a white tiger in the west of the sky, and there is Xiyue under it. The North Pole in the sky is the average day, and the underground is Zhongyue Mountain. There are Tianhe Tianhan in the sky and the Yangtze River and Yellow River underground. There are four walls and nine wild fields in the sky, a wall bureau under the ground to build the city, and a land division to build Kyushu. In ancient times, the sky constellation was divided into five parts: east, west, south, north and middle, which were called the five palaces. In the middle is the Palace, which includes three walls: the upper wall is too small, that is, the starry sky, Zhang Su, plain clothes and the sky area north of plain clothes. The purple microcline in the Central Plains, that is, around the North Pole, includes an ordinary sky area along the Yellow River Basin in China (latitude about 36 degrees). Xiayuan Stone Sky City Wall, namely the sky area north of Su Fang, Shinjuku, Su Wei, Jisu and Dousu. There are some stars on each side of the three walls as a frame, which defines the scope of these three sky areas. They seem to be walls, so they are called walls. Of the three walls, the Ziwei Courtyard is the center of heaven and the place where the Emperor of Heaven lives. Therefore, the palaces where the Emperor lives are also called Wei Zi Palace and Forbidden City. Because of this, when the ancient He Lv family chose the capital, the mountains and rivers on the ground should also conform to the three walls. This practice not only plays a certain role in the concept of organic nature, but also has the concept of imperial power or imperial power. "Instructions for the Son of Man" says that the imperial capital is the supreme place, and the geographical greatness is not before this. The Star Source Bureau must join before it can be established. For example, in Beijing, the Yanshan Mountains in the back are like the sky, and the Yellow River winds forward, such as the Imperial Valley in the sky. On the right is Taihang Mountain, on the left are the islands in the sea, Liaodong Peninsula and Shandong Peninsula, in the middle is the Central Plains, and on the south is Qinling Mountain and Dabie Mountain, forming a wall bureau, which is an ideal place for geomantic omen.