Caravansary of Qusheh. Time-exposure image of star trails above the caravansary of Qusheh near the city of Damghan, Iran. This desert caravansary was built on the Silk Road, near an ancient city known as Qumis (Hecatompylos), dating from 200 BC, which is now buried under the desert. Star trails are formed by the apparent motion of the stars in the sky as the Earth rotates on its axis. Here, in the northern hemisphere, the star trails form concentric circles around the north celestial pole.
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