A rare total solar eclipse began in the Western state of Oregon Monday, as millions of people across the U.S. are watching the phenomenon from the Pacific to the Atlantic for the first time in 99 years.
Millions Across US Marvel at Total Solar Eclipse

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Guests reacts to the total eclipse in the football stadium at Southern Illinois University in Carbondale, Illinois, August 21, 2017.

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People watch as the solar eclipse approaches totality from Clingmans Dome, which at 6,643 feet (2,025m) is the highest point in the Great Smoky Mountains National Park, Tennessee, Aug. 21, 2017.

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From left, Ivanka Trump, daughter of President Donald Trump, first lady Melania Trump, President Donald Trump, and their son Barron Trump view the solar eclipse at the White House in Washington, D.C., Aug. 21, 2017.

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Michelle Campano (Right) and her sisters Jennifer (Middle) and Lauren Campano, all of Rockville, Maryland, check on the position of the sun using homemade solar viewers from the flight deck of the Naval museum ship U.S.S. Yorktown during the Great American Eclipse in Mount Pleasant, South Carolina, Aug. 21, 2017.