You can watch the total eclipse on WOOD TV8 and Monday.

(AP) — Millions of Americans converged on a narrow corridor stretching from Oregon to South Carolina to watch the moon blot out the midday sun Monday for a wondrous couple of minutes in the first total solar eclipse to sweep coast to coast in 99 years.

Veteran eclipse watchers warned the uninitiated to get ready to be blown away. One group from West Michigan drove to Fairmont, Nebraska for the show. Trip organizer Dave DeBruyn, Astronomy specialist with the Chaffee Planetarium in the Grand Rapids Public Museum says he picked Nebraska for two reasons. The first is the sunny climatology that graces Nebraska through the month of August, increasing the chance of a cloud-free eclipse. The second was the hope that the small town of Fairmont, NE would be much less crowded than places like Nashville or Carbondale. The group he has organized is close to 80. He says he wanted as many to see the eclipse as possible, because it is such a surreal experience.

“When the shadow is coming forwards you it’s basically the moon’s shadow projected onto the earth it’s coming at 1,700 miles an hour so it’s just racing and then suddenly it envelopes you and that last little sliver of sunlight bright sunlight disappears and suddenly you’re in this semi darkness in this surreal experience. It’s one of those things you just can never forget I remember my first eclipse it was way back in 1963 and I remember it very very clearly.” says DeBruyn.

DeBruyn has seen several eclipses. He has chased them as far as the Canary Islands where the moment of totality lasted a full seven minutes. Along with him on that trip and this current one to Nebraska is Mark Boyd.

“I worked for Dave at the Grand Rapids public museum at the planetarium I worked there for six years doing public sky shows. Dave was also a great mentor for me helped me get really interested in astronomy and led to career choices and lots of things later in life.” says Boyd.

Boyd says DeBruyn has helped excite many in astronomy, and has even steered a few students towards a career in it.

Planetariums and museums posted “Sold out of eclipse glasses” on their front doors. Signs along highways reminded motorists of “Solar Eclipse Monday,” while cars bore the message “Eclipse or bust.”

With 200 million people within a day’s drive of the path of totality, towns and parks braced for monumental crowds. It’s expected to be the most observed, most studied and most photographed eclipse ever. Not to mention the most festive, what with all the parties.

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

“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.>>Inside Total eclipse coverage

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

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 the poles. This will be 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. That was 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 before the eclipse veered in Canada.

Monday’s total eclipse will cast a shadow that will race through 14 states, entering near Lincoln City, Oregon, at 1:16 p.m. EDT, moving diagonally across the heartland and then exiting near Charleston, South Carolina, at 2:47 p.m. EDT. The path will cut 2,600 miles (4,200 kilometers) across the land and will be just 60 to 70 miles (96 kilometers to 113 kilometers) wide.

Mostly clear skies beckoned along much of the route, according to the National Weather Service.

Shawnee National Forest in southern Illinois will see the longest stretch of darkness: 2 minutes and 44 seconds.

All of North America will get at least a partial eclipse. Central America and the top of South America will also see the moon cover part of the sun.

Michele Arsenault of New York City and her son, Michael, spent Sunday driving south and stopped for dinner in Asheville, North Carolina, at the Tupelo Honey Cafe where several other tables were also occupied by travelers heading to eclipse zones. Arsenault has been comparing weather charts for days as she finalized plans and had lodging reserved in Knoxville, Tennessee, and a reserved parking spot in Sweetwater, about 50 miles (80 kilometers) away. Her son, who’s about to start graduate school, said he tagged along because “I appreciate the idea of a good adventure.”

NASA and other scientists will be watching and analyzing the eclipse from telescopes the ground and in orbit, the International Space Station, airplanes and scores of high-altitude balloons, which will beam back live video. Citizen scientists will monitor animal and plant behavior as daylight turns into twilight and the temperature drops.

NASA’s associate administrator for science missions, Thomas Zurbuchen, took to the skies for a dry run Sunday. He will usher in the eclipse over the Pacific Coast from a NASA plane.

“Can’t wait for the cosmic moment Mon morning,” he tweeted.

Near Victoria, British Columbia, where 91 percent of the sun will be eclipsed, science and math teacher Clayton Uyeda is planning to watch from a ferry along with his wife. He said he is “expecting to have a real sense of connection with the heavens.”

He has similarly lofty hopes for his students if they can bring themselves to look up at the sky instead of down at their electronic devices.

Scientists everywhere agree with Uyeda: Put the phones and cameras down and enjoy the greatest natural show on Earth with your own (protected) eyes.

The only time it’s safe to look directly without protective eyewear is during totality, when the sun is 100 percent covered. Otherwise, keep the solar specs on or use pinhole projectors that can cast an image of the eclipse.

The next total solar eclipse in the U.S. will be in 2024. The next coast-to-coast one will not be until 2045.

___Associated Press writers Gillian Flaccus in Salem, Oregon, and Beth Harpaz in Ashville, North Carolina, contributed to this report.