There is a difference between evil wind and yang wind. At the end of Qing Dynasty, He Guangting said in "geoscience correction": "Pingyang is not afraid of the wind, but there is a difference between Yin and Yang. The warm wind from east to south is called yang wind, so it is just right. The cool wind and cold wind from west to north, called evil wind, are stopped by recent examples, otherwise the wind will blow the bones and chill the family. " This is to avoid the northwest wind.
Sitting facing south is not only for lighting, but also for shelter from the 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 Tiangan Party A and Party B as the east, Ding Bing 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, the east is black dragon, the west is white tiger, the south is suzaku, and the north is Xuanwu. Or: "Left Qinglong, right White Tiger, Former Suzaku, Later Xuanwu."