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An estimated 300,000 tourists have flocked to Chile's Coquimbo region, where dryness, crystal-clear air and low light pollution has created a stargazers' paradise.
Day will briefly turn to night Tuesday over large parts of Chile and Argentina as a total eclipse of the Sun plunges a vast swath of the southern Pacific and the cone of South America into darkness.
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Both countries will be under the narrow, 6,000-mile long band that will experience a total eclipse when the Moon will completely block the Sun.
According to Chilean astronomers, the breathtaking natural phenomenon will begin at 1:01 p.m. local time (5:01 p.m. GMT) in the Pacific Ocean and a 95 mile (150 kilometer)-wide band of total darkness is set to reach Chile's coast 4:38 p.m. (8:38 p.m. GMT), then cross into southeastern Argentina.
People in some areas under the path of the eclipse will experience more than two minutes of total darkness, the Chilean Foundation of Astronomy says.
"There's a lot of expectation. This is a historic event in the region," said Catalina Henriquez, who runs an astrotourism agency in Vicuna, a town 280 miles north of Santiago renowned for clear skies that have made it Chile's "astronomy capital".
Vicuna is part of the Coquimbo region that is dotted with observatories equipped with high-powered telescopes and where the eclipse will be strongest.
An estimated 300,000 tourists have flocked to the region where dryness, crystal-clear air and low light pollution has created a stargazers' paradise.
Thousands of people have descended on the nearby town of La Higuera, located on the so-called "path of totality," where the eclipse is predicted to last longest, around 2 minutes and 36 seconds.
La Silla Observatory and its fleet of powerful telescopes will livestream the event on the internet and has also opened to the public, hosting school tours along with talks and workshops.
"The 2019 total solar eclipse will last about 1 minute and 52 seconds from the La Silla summit. The Sun will be setting just as the entire eclipse ends and the peak of totality will happen when the Sun is a mere 13 degrees above the horizon from the view of La Silla Observatory," the observatory said.
Further south, the capital Santiago will experience a near-total eclipse.
Solar eclipses happen when the Sun, the Moon and Earth line up, allowing the Moon to cast its shadow on Earth.
The next total eclipse will be visible in southern Chile on December 14, 2020.
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