Wednesday, September 21, 2011

Why Doesn't The North Star Move in the Sky?

Have you ever wondered why the so called North Star (sometimes called Pole Star) doesn't move in the sky? Well actually this is one of the most often asked questions in astronomy.

The answer actually is very simple. The so called North Star does not move as it is above the North Pole and the axis of Earth's rotation. Thus the rotation of our planet causes the movement of the stars in the sky except for the North Star.

The interesting thing is that stars also move a little, also the axis of rotation of planet Earth also shifts slowly. Thus the role of the "North Star" changes among stars throughout time.

The picture shows star movement in the sky:



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