On Aug. 21, 2017, American skywatchers will be treated to a rare and spectacular celestial show -- the first total solar eclipse visible from the continental United States in nearly four decades. Here's what to look for.
On Aug. 21, 2017, American skywatchers will be treated to a rare and spectacular celestial show -- the first total solar eclipse visible from the continental United States in nearly four decades. Here's what to look for.
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