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Startrails above Sölden
EPOD 2007-12-20
The fact that the celestial sphere is rotating (or more accurately, of course, that the Earth is), can be seen when observing long-term exposures of the sky. In particular close to the celestial equator, rather dramatic star-trail pictures like this one captured during almost 3 hours at the Soelden ski resort (2700 m asl), gives a impression of the apparent motion of celestial sphere. The effect comes about as the celestial equator, a plane dividing the celestial sphere in a Northern and a Southern half, passes right through the constellation of Orion, which is seen in the lower center of the picture.
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