G. AVILA / EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY G. AVILA / EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY
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Circumhorizontal arc over astronomy site. This rare band of colours forms when the sun is very high in the sky, higher than 58 degrees. A circumhorizontal arc is a very large halo that is always parallel to the ground. This example was photographed in September 2016, over a unit at the Very Large Telescope (VLT) site, operated by the European Southern Observatory (ESO) in Chile.
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