How to divide the yin and yang sides of the arched shed in the north-south direction?

It is sunny in the east and cloudy in the west.

According to the method of judging the yin and yang slopes of the north and south mountains in geography, we can know that it is sunny in the east and cloudy in the west. In addition, according to the exposure of the sun, the sun rises and sets in the west, so the sheds in the east are mostly sunny, and there is less shade in the west.