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A thin crescent sun is viewed just before totality during a solar eclipse seen from the Lowell Observatory Solar Eclipse Experience on August 21, 2017 in Madras, Oregon. - Emotional sky-gazers on the US West Coast cheered and applauded Monday as the Sun briefly vanished behind the Moon -- a rare total solar eclipse that will stretch across North America for the first time in nearly a century. (Photo by STAN HONDA / AFP)