The Pole or North Star
If you lie on your back looking at the night sky for a few hours, you will notice the sky rotating very slowly. In fact the sky will rotate once in a little less than twenty four hours so you will not be able to see a full rotation. During this rotation there will be a star in the night sky that appears to remain stationary. This star is called the Pole or North Star, and is on the axis of rotation of the Earth.
![](/ib-physics/astrophysics/pole-star-1.jpg)
If you point a camera at the sky and leave the film exposed for a few hours, the rotation, and the position of the Pole Star is obvious.>/br>![](/ib-physics/astrophysics/pole-star-2.jpg)
You have no rights to post comments