Geographically, China is in the northern hemisphere of the earth. In the day when the sun rises and sets, only houses facing south can get more sunshine time in a day than houses in other directions, so people who live in houses facing south for a long time will be healthier than those in other directions because they can get less water in the house.
Then there is what the ancients called five lines of gossip. Five lines of gossip said that "the east is wood, the south is fire, the west is gold, and the north is water", and the emperor thought that he was the embodiment of the real dragon and the statue of the Ninth Five-Year Plan. So, of course, he is going to sit on the water to put out the fire, which is lucky. Although the ancient people's understanding of geography and climate was not as full as that of modern people, five lines of gossip's explanation of this article is still practical.
In addition, in the Book of Changes, there is also a saying that "those who leave are also clear, everything meets, and Nanbu is also." This sentence means that in gossip, divination symbolizes light. When the sun is in the middle position, it shines in the south, and everything in the world can get light. This is divination on behalf of the south, so the emperor chose to sit in the north and meet the minister facing south, symbolizing the rule of the world facing the light.
In fact, no matter what reason the ancient emperors chose to sit facing south, they must be thinking of the bright side.