Why does the Big Dipper revolve around the North Star?

The photo above is an image obtained by a camera aiming at the north for a long time. It is obvious that all celestial bodies revolve around the north celestial pole. There is a special term in astronomy called the Sunday motion of celestial bodies, which is due to the rotation of the earth, resulting in regular changes in the position of celestial bodies.

Now the answer can be given. The celestial bodies caused by the earth's rotation revolve around the northern celestial bodies, and the Big Dipper is no exception. At present, Polaris is very close to the northern celestial bodies, and it can be approximately thought that all celestial bodies revolve around Polaris.