As far as astrology is concerned, Beijing is in the northeast, which is the projection of the Big Dipper on the earth. The Big Dipper is the center of the sky, and Beijing is naturally the center of the world, so the Forbidden City plans its palaces in strict accordance with the central axis. Among them, the Fengtian Hall (now the Hall of Supreme Harmony) is in the middle, higher than other palaces, and it is the place where the Emperor holds grand ceremonies and accepts congratulations. Gaihua Hall (now Zhonghe Hall), Shenshen Hall (now Baohe Hall) and Hou Jing Palace, Gan Qing Palace, Jiaotai Palace and Kunning Palace are all on the central axis. Other palaces in the Forbidden City are symmetrically arranged from left to right: the inner court is outside, the Wenhua Hall is on the left and the Wuying Hall is on the right; Followed by the bedroom, the main palace (that is, the uterine palace) is located in the east, and the harem is located in the west.
China people pay attention to the same strain. Long Mai in the Forbidden City started from Kunlun Mountain, which is full of vitality in the sky, just like the sky, so the Forbidden City is also full of vitality in the sky. Primitive energy is the source of life in the universe and the energy of all living things. Only when there is vitality can there be vitality, then Beijing and the Forbidden City will be full of vitality and become a permanent foundation for generations to come. In many ancient books of the Ming and Qing Dynasties, many scholars are demonstrating that the mountain range of the Forbidden City is connected with Kunlun Mountain, which is actually demonstrating China people's understanding of the universe and the cosmic philosophy formed: Qi is the source of all things and the foundation of all things.
The urban planning and construction in ancient China is famous for its overall plane layout, ingenious connection and combination. An important principle of connection combination is clarity and symmetry. Its guiding ideology is the coordination and symmetrical balance of yin and yang in geomantic geography. The "Nine Classics and Nine Wefts" put forward by Zhou Li Kao Gong Ji takes the central axis as the axis of symmetry. The layout of "left group and right house, Qian Chao's posterior lobe" is also the embodiment of the concept of symmetry between yin and yang. Symmetry means harmony. Take Beijing as an example. There is the Temple of Heaven in the south and the Ditan in the north. There is a moon altar in the east and an altar in the west; On the left is the ancestral hall and on the right is the social altar. Ancestral temple is yin, offering sacrifices to ancestors. The altar of the country is the sun, offering sacrifices to the gods of land and grain. The center of symmetry is the feng shui point. According to the concept of Feng Shui, Yin and Yang are two poles of a thing, which are interdependent and indispensable. Harmony between yin and yang is reflected in the plane layout of the city, which is symmetry and clarity.
The buildings on the central axis of the Forbidden City are Yongdingmen-Arrow Tower-Zhengyang Gate-Duanmen-Wumen Gate-Inner Gate-Jinshui Bridge-Taihe Gate-Taihe Hall-Zhonghe Hall-Baohe Hall-Gan Qing Gate-Gan Qing Palace-Jiaotai Hall-Kunning Palace-Kunning Gate. The building axis is fifteen miles, which is the highest in the world, and it also embodies the foundation of building according to the number of Luoshu azimuth constant. Dividing the left and right sides based on the central axis is the concept of "Yin and Yang" in China traditional culture, which has been widely used in various fields, and even the so-called "symmetrical beauty" has appeared in architectural knowledge.