Wednesday, October 10, 2012

Picture of the Day: 10/10/12

Nauset Lighthouse on Cape Cod. Source

The lighthouse in this picture is fixed, as you might be able to tell, yet the stars seem to be spinning around in circles. Why is that? Well, the star's positions are fixed in relation to our solar system (they do change a little over time, but barely), it is the Earth's rotation that makes them look like they are rising and falling. This image was taken over a long period of time and shows that rotation.

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