Why do stars shift?

It's not because you see the earth's rotation at the same time every day, it's not because the earth rotates.

The reason is that because of the revolution of the earth, the position of the earth is constantly changing, and the positions of the stars seen in different positions are definitely different.

However, because some stars are far away, it is not easy to see these changes, and some are close and easy to see the movement. This is why the starry sky is different in winter and summer.