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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.

What happens to the surface of the moon during a total lunar eclipse, when all of Earth's sunrises and sunsets are projected onto it?

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