GORDON GARRADD / SCIENCE PHOTO LIBRARY GORDON GARRADD / SCIENCE PHOTO LIBRARY
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Long-exposure wide-angle photograph of the constellation of Orion. The rotation of the earth has caused each point of light to trace out a streak on the film called a star trail. This photograph (taken in Australia) includes the celestial equator; those star trails which are almost straight are formed by stars lying close to this equator. Stars south of this line form trails along concentric circles centred on the south celestial pole. Those north of this line form star trails along concentric circles centred on the north celestial pole (which will be below the horizon). The colour of each trail is related to the surface temperature of the star producing it.
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