WATCH: Today's Total Solar Eclipse

(AP) — Americans with telescopes, cameras and protective glasses staked out viewing spots along a narrow corridor from Oregon to South Carolina to watch the moon blot out the midday sun Monday in what promised to be the most observed and photographed eclipse in history.

Eclipse-watchers everywhere — and millions were expected to peer at the sun — fretted about the weather and hoped for clear skies for the first total solar eclipse to sweep coast-to-coast across the U.S. in practically a century.

As he set up telescopes, Ray Cooper, a volunteer with the Oregon Museum of Science and Industry in Salem, worried offshore clouds might roll in and spoil the less than two-minute show.

“If it stays like this, it will be perfect,” Cooper said on the eve of the big day. He has seen full solar eclipses before, but never so close to home, making this one extra special.

With 200 million people within a day’s drive of Monday’s path of totality, towns and parks braced for monumental crowds.

In Salem, a field outside the state fairgrounds was transformed into a campground in advance of an eclipse-watching party for 8,500, courtesy of the Oregon Museum of Science and Industry.

“It’s one of those ‘check the box’ kind of things in life,” said Hilary O’Hollaren, who drove 30 miles from Portland with her two teenagers and a tent, plus a couple friends.

Astronomers consider a full solar eclipse the grandest of cosmic spectacles.

>>Inside woodtv.com: Total eclipse coverage


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