Why does the emperor sit facing south?

When the emperor goes to court, he should sit facing south. What is the origin?

From yin-yang theory and divination:

The wind is changeable. There are records of wind measurement in Oracle Bone Inscriptions. "Historical Records" says: "Evil winds live in the northwest, and October is also. It's also November when the vast desert winds live in the north. In the first month, the wind lived in the northeast. Fengzhu East is also in February. "

There is a difference between evil wind and yang wind. He Guangting said in Corrected Geography in the late Qing Dynasty: "Pingyang is not afraid of the wind, but there is a difference between Yin and Yang. It's just as well to call the warm wind and warm wind from east to south yang wind. The cold wind from west to north is called the evil wind, so it is advisable to stop it with the recent case, otherwise the wind will blow the bones and the main family will be defeated. " This is to avoid the northwest wind.

There are several ways to express the position in geomantic omen: First, take the five elements of wood as the east, fire as the south, gold as the west, water as the north and soil as the middle. Second, take gossip as the south, ridge as the north, earthquake as the east and exchange as the west. Third, take Party A and Party B as the east, Party D as the south, Geng Xin as the west and Gui Ren as the north. Take the son of the earthly branch as the north and the noon as the south. Fourth, there are black dragons in the east, white tigers in the west, suzaku in the south and Xuanwu in the north. Or: "Left Qinglong, right White Tiger, Former Suzaku, Later Xuanwu." Talking about the layout of "Acupoint Password Xing Junzhi": the temple is in the center, in front of the door, the side warehouse is behind, and the breeze, scenery and sales office meander to the left, with a dragon elephant. The first floor of "Mingyue" is independent southwest, and according to the words of Yin and Yang, it looks like a tiger house.