What is the origin of the ancient emperor's accession to the throne called facing south and facing north?

To become an emperor. In feudal society, the emperor set up a seat with the south facing the north, hence the name!

1. In ancient times, the south was regarded as supreme, while the north symbolized failure and submission. The palaces and temples face south, and the emperor's seat faces south. When he became emperor, he called it "Nanrong"; Defeat, surrender to others, "defeat" and "surrender to the north." It is precisely because the direction of due south is so noble that when people built houses in the past, no one dared to take the direction of due south of the meridian, both east and west, so as not to violate taboos and be convicted.

In addition to respecting the south and the north, in the east and the west, the ancients also took the east as the first and the west as the second. The residence of the queen and concubines is divided into East Palace and West Palace, of which East Palace is the most important, followed by West Palace. Ancestral temples dedicated to ancestral tablets should be built on the east side of the palace. The "master" and "landlord" in modern Chinese also come from this.

Besides the east, west, north and south, there are also high and low points to indicate the direction. The ancient emperor was supreme, sitting north facing south, with the East on his left. Therefore, while advocating the East, the "Left" has also become noble.

References:

Zhouyi