Chengdu’s urban layout is not Zhengnan Zhengbei

Chengdu is a checkerboard city, but the street is not just south and north, but clockwise skewed by 28.5 degrees. The reason is that from the time of the Golden Sands, its pattern is the sunrise orientation towards the winter solstice, and the altar of the Jinsha site is skewed by 28.5 degrees.