Identify the motion of Earth that causes these stars to appear to move in a circular path.

The rotation of the Earth on its axis makes it look like everything

in the sky is moving in a circular path.

- - The Earth is rotating.

- - We are rotating along with it.

- - In order to keep looking at the same object in the sky, you must

constantly change the direction in which you're looking.

- - You can't feel the Earth rotating, so as you keep changing

the direction of your eyes to follow the object, your brain interprets

that to indicate that the object itself is moving in a circular path

across the sky.