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Why a total solar eclipse is such a big deal

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On August 21, 2017, a total solar eclipse is coming to the continental United States for the first time in 38 years, which may make it the most viewed total solar eclipse in history. Vox explains the orbital mechanics of the earth-moon-sun system.

During an eclipse, what causes the pearly chain of light around the moon before the glow of the sun's corona?

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