Taken by Eugene on August 21, 2017 @ Protvino, Russia
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  Camera Used: Canon Canon EOS 5D Mark II
Exposure Time: 1/400
Aperture: f/14.0
ISO: 800
Date Taken: 2017:09:21 21:09:27
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Something like clouds (or waves of density) appeared at dawn on August 21, 2017 in Protvino, Central Russia. The sky was absolutely cloudless. The structures were blocks of regular dark-bright stripes with equal intervals between them and bounded along the edges by clearly imaginable straight lines. Unlike ordinary clouds, they were devoid of any internal structure. The focus of the blocks did not coincide with the rising Sun.
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