On which side of the three walls is the Big Dipper? How to divide three walls?

The north of Ziwei Garden is extremely centered, including the sky area within 50 degrees north latitude.

Taiwei Courtyard is the upper wall of Sanyuan, located in the lower northeast of Ziwei Courtyard and south of Beidou. It occupies about 63 degrees in the sky.

The Shi Tian Wall is a three-dimensional lower wall, which is located in the southeast direction under the Wei Zi Wall, accounting for about 57 degrees in the sky.