What is the relationship between the construction of Daming Palace in Tang Dynasty and the geomantic omen in Chang 'an?

In ancient China, spiritual belief played a very important role in people's daily life, and people tried their best to pursue the ideal realm of interaction and unity between heaven and man. This idea is embodied in the planning and layout of the capital, which adds to the mystery of the emperor's theocracy. Ancient urban planning was deeply influenced by China's traditional cultural thought of "harmony between man and nature", which often contained lofty feelings of "transforming the natural image of heaven and earth into the image of human heart". It has the urban planning concept of "saving the world by inches". Cities on the ground are often a portrayal of the sky, which makes cities a symbol of the universe. This is especially true in the capital where the "Emperor of Heaven" lives, and Chang 'an, the capital, is no exception. In fact, from the height of Liupo, the terrain gradually decreases from south to north. Then Miyagi's status is relatively low. There is another reason why Miyagi is not set at the top. According to the position of the stars in the sky, the most distinguished Wei Zi Palace is located in the center of the northern sky. At the extreme center of the north, there are 15 stars around it from east to west (i.e. left pivot and right pivot). The ancients thought that Wei Zi Palace was the seat of the emperor, which means the imperial palace. The emperor is the son of heaven, and the monarch on the earth should correspond to the stars in the sky. So the palace can only be arranged in the center of the north. Moreover, there is the Weihe River in the north, which is the safest from a defensive point of view.