Why did emperors in ancient times set their capital in the north instead of the south?

In ancient times, the south was regarded as the supreme, while the north was symbolized as failure and surrender. Palaces and temples all faced due south, and the emperor's seat always faced south. When he became the emperor, he was said to be "honored by the south"; when he lost a battle or submitted to others, he was "defeated" and "called his subject by the north." It is precisely because the direction of due south is so honored that in the past, when people built houses, no one dared to take the direction of due south of the meridian. They always moved east or west to avoid violating taboos and being punished.

The north, especially the Central Plains, was the earliest developed and most developed place in ancient times. In the past, both economy and culture were the most developed. Those who conquered the Central Plains conquered the world. Therefore, there is a saying of competing in the Central Plains. Chang'an Luoyang and Luoyang have been symbols of orthodox dynasties since ancient times. The development of the south was relatively late. Although it was developed during the Wu Dynasty of the Three Kingdoms and the crossing of the Yangtze River during the Jin Dynasty also promoted the development of the south, it was the Song Dynasty that truly prospered and developed. Therefore, it is difficult for the south to have a strong political and economic foundation and deep cultural deposits. To serve as the political and cultural center of a country.