At 4: 39 p.m. regional time on July 2, fish of the South Pacific and some fortunate individuals in southern Chile and Argentina will be plunged into unusual afternoon darkness.

It will be the very first overall solar eclipse because August 21, 2017, and the only celestial occasion of its kind in2019

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Throughout an overall solar eclipse, the moon passes in between Earth and the sun, casting a little dark shadow on our world. For those seeing in the world, the moon appears to cover the sun, with a ring of the sun’s light surrounding the moon. Looking straight at that light needs unique glasses to secure the eyes from the sun’s brightness.

Ana Pelisson

The eclipse’s course of totality– in which the sun is completely obstructed from view by the moon– is an adequate length of 6,000 miles, though the majority of that is over the Pacific Ocean and a narrow band of Chile and Argentina.

Audiences in South America will experience totality for about 2 1/2 minutes, approximately the exact same period as the 2017 eclipse that crossed the continental United States. La Serena, a city on Chile’s western coast, will be the very first to go dark.

Totality will last the longest over a remote part of the Pacific Ocean west of South America, where the sun will go dark for 4 minutes and 32 seconds (That point is represented by the black sun in the map listed below.)

Projected course of the 2019 overall solar eclipse.
NASA/Terra Metrics

The late timing for tomorrow’s eclipse suggests that totality will take place about one hour and 18 minutes prior to sundown, when the sun is low in the sky– simply 13 degrees above the horizon.

That might make seeing the occasion a bit tough, because low-lying clouds might obscure the phenomenon. Scientists will likewise require to peer through more of Earth’s hazy environment to get a clear picture of what’s taking place in the sky.

Totality represents a distinct chance for researchers who study the sun. It’s the only time that the solar corona– the sheath of high-speed super-hot particles that ensconce the sun– shows up to observers.

Periodically, the corona spits out bursts of scorching-hot plasma, which can be in between 1.7 million degrees Fahrenheit and more than 17 million degrees, hotter than the surface area of the sun itself. These bursts, called coronal mass ejections, can toss towards Earth at speeds of 1,384 miles per second Their results can interrupt our telecoms facilities, knock out power grids, and impact satellites in orbit

By observing and evaluating the corona’s habits throughout eclipses, researchers collect details that can assist them much better comprehend and anticipate these coronal mass ejections.

Solar eclipse on May 21, 2012, in Tokyo.
Getty Images/Masashi Hara

The next overall solar eclipse will take place less than 18 months after this one. On December 14, 2020, another overall eclipse will take a trip over Chile and Argentina.

The next overall solar eclipse that individuals will have the ability to see from The United States and Canada will take place on April 8, 2024