Circumpolar star-trails above Deh Namak caravansary on the ancient Silk Road, Iran.

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Photo credit: © BABAK TAFRESHI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: ancient, astronomy, astrophysics, caravansary, circumpolar, dah, iran, namak, road, science, silk, star, star-trails, stars, startrail, track, tracks, trail, trails