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BERLIN, GERMANY - MARCH 20: Carl, 4, uses special glasses to look into the sky at a partial solar eclipse near the Brandenburg Gate on March 20, 2015 in Berlin, Germany. Over Central Europe the moon was scheduled to cover approximately 75% of the sun for a short period starting at approximately 9:30am. The next solar eclipse will not occur until 2021. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MARCH 20:  Carl, 4, uses special glasses to look into the sky at a partial solar eclipse near the Brandenburg Gate on March 20, 2015 in Berlin, Germany. Over Central Europe the moon was scheduled to cover approximately 75% of the sun for a short period starting at approximately 9:30am. The next solar eclipse will not occur until 2021.  (Photo by Sean Gallup/Getty Images)