The Great American Eclipse completed its journey across the United States Monday, with the path of totality stretching coast-to-coast for the first time in nearly a century.
Totality began over Oregon at about 1716 GMT and ended at 1848 GMT over Charleston, South Carolina where sky-gazers whooped and cheered as the Moon moved directly in front of the Sun.
"It was incredibly beautiful. I am moved to tears," said Heather Riser, sitting on a blanket in Waterfront Park in Charleston, a bustling East Coast city where thousands had gathered to watch.
With 200 million people within a day's drive from the path of totality, towns and parks braced for monumental crowds. Clear skies beckoned along most of the route, to the relief of those who feared cloud cover would spoil this once-in-a-lifetime moment.
Astronomers were giddy with excitement. A solar eclipse is considered one of the grandest of cosmic spectacles.
NASA solar physicist Alex Young said the last time earthlings had a connection like this to the heavens was during man's first flight to the moon, on Apollo 8 in 1968. The first, famous Earthrise photo came from that mission and, like this eclipse, showed us "we are part of something bigger."
With half hour to go before totality, NASA's acting administrator, Robert Lightfoot, enjoyed the moon's "first bites out of the sun" from a plane flying over the Oregon coast and declared it "just an incredible view."
"I'm about to fight this man for a window seat," Lightfoot said, referring to a fellow NASA scientist.
The Earth, moon and sun line up perfectly every one to three years, briefly turning day into night for a sliver of the planet. But these sights normally are in no man's land, like the vast Pacific or Earth's poles. This is the first eclipse of the social media era to pass through such a heavily populated area.
The moon hasn't thrown this much shade at the U.S. since 1918, during the country's last coast-to-coast total eclipse. In fact, the U.S. mainland hasn't seen a total solar eclipse since 1979 — and even then, only five states in the Northwest experienced total darkness.
"It's really, really, really, really awesome," said 9-year-old Cami Smith as she watched the fully eclipsed sun from a gravel lane near her grandfather's home at Beverly Beach, Oregon.
Scientists said the total eclipse would cast a shadow that would race 2,600 miles (4,200 kilometers) through 14 states, entering near Lincoln City, Oregon, at 1:16 p.m. EDT, moving diagonally across the heartland over Casper, Wyoming, Carbondale, Illinois, and Nashville, Tennessee, and then exiting near Charleston, South Carolina, at 2:47 p.m. EDT.
Shawnee National Forest in southern Illinois was in line to see the longest stretch of darkness: 2 minutes and 44 seconds.
All of North America was on track to get at least a partial eclipse, along with Central America and the top of South America.
Joe Roth, an amateur photographer, traveled south from the Chicago area to Alto Pass, Illinois, to catch his first total solar eclipse — on his 62nd birthday, no less. He said the stars aligned for him — "a Kodak moment for me to cherish and experience."
Kim Kniseley drove overnight from Roanoke, Virginia, arriving in Madisonville, Tennessee, before dawn to get a parking spot at Kefauver Park, where by sunrise dozens of folks had claimed benches and set up tents.
He said he could have stayed home in Roanoke and seen a partial eclipse of 90 percent, but that would have been like "going to a rock concert and you're standing in the parking lot."
Hoping to learn more about the sun's composition and activity, NASA and other scientists watched and analyzed from telescopes on the ground and in orbit, the International Space Station, airplanes and scores of high-altitude balloons beaming back live video.
Citizen scientists also planned to monitor animal and plant behavior as daylight turned into twilight and the temperature dropped. Thousands of people streamed into the Nashville Zoo just to watch the animals' reaction.
Scientists warned people not to look into the sun without protection, except when the sun is 100 percent covered. Otherwise, to avoid eye damage, keep the solar specs on or use pinhole projectors that can cast an image of the eclipse into a box.
The next total solar eclipse in the U.S. will be in 2024. The next coast-to-coast one will not be until 2045.
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