Update | A total solar eclipse begins its race across North America

MESQUITE, Texas (AP) — A chilly, midday darkness fell across North America on Monday as a total solar eclipse began its race across the continent, thrilling those lucky enough to behold the spectacle through clear skies.

Eclipse mania gripped all of Mexico, the US and Canada, as the moon swept in front of the sun, blotting out daylight. Almost everyone in North America was guaranteed at least a partial eclipse, weather permitting.

It was the continent's biggest eclipse audience ever, with a couple hundred million people living in or near the shadow's path, plus scores of out-of-towners flocking in.

Clouds blanketed most of Texas as total solar eclipse began its diagonal dash across land, starting along Mexico's mostly clear Pacific coast and aiming for Texas and 14 other US States, before exiting into the North Atlantic near Newfoundland.

Arkansas and northeast New England were the best bets in the US New Brunswick and Newfoundland in Canada also looked promising.

The show got underway in the Pacific before noon EDT. As the darkness of totality reached the Mexican resort city of Mazatlan, the faces of spectators were illuminated only by the screens of their cellphones.

In Georgetown, Texas, the hundreds gathered on the Southwestern University lawn cheered when the skies cleared just in time to give spectators a clear view.

"We are really lucky," said Georgetown resident Susan Robertson. "Even with the clouds it is kind of nice because when it clears up it is like wow."

The cliff-hanging uncertainty added to the drama. But the overcast skies in Mesquite near Dallas didn't rattle Erin Froneberger, who was in town for business and brought along her eclipse glasses.

"We are always just rushing, rushing, rushing," she said. "But this is an event that we can just take a moment, a few seconds that it's going to happen and embrace it."

At Niagara Falls State Park, tourists streamed in under cloudy skies with wagons, strollers, coolers and lawn chairs. Park officials expected a large crowd at the popular site overlooking the falls.

During Monday's full eclipse, the moon slipped right in front of the sun, entirely blocking it. The resulting twilight, with only the sun's outer atmosphere or corona visible, would be long enough for birds and other animals to fall silent, and for planets, stars and maybe even a comet to pop out.

The out-of-sync darkness lasts up to 4 minutes, 28 seconds. That's almost twice as long as it was during the US coast-to-coast eclipse seven years ago because the moon is closer to Earth. It will be another 21 years before the US sees another total solar eclipse on this scale.

It will take just 1 hour, 40 minutes for the moon's shadow to race more than 4,000 miles (6,500 kilometres) across the continent.

Eye protection is needed with proper eclipse glasses and filters to look at the sun, except when it ducks completely out of sight during an eclipse.

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