For those watching the celestial event, the moon appears to cover the sun, with a ring of the sun's light surrounding the moon.
The Exploratorium museum in San Francisco will host a livestream of the view from the National Science Foundation's Cerro Tololo Observatory in Chile, with the eclipse beginning at 12:23pm Pacific Time.
The total eclipse itself will last for four minutes and 33 seconds.
Prior to the 2017 event, a solar eclipse had not been visible across the entire USA since 1918.
A solar eclipse takes place when the Sun, Moon and Earth are all in a straight line, such that the Moon blocks the Sun's rays from reaching the Earth.
The eclipse will trace a path of totality (area of total darkening) over a narrow swath of the South Pacific, and then over land across Chile and Argentina.
A partial solar eclipse will be visible in Ecuador, Peru, Bolivia, Paraguay, Uruguay, Colombia, Brazil, Venezuela, and Panama, according to NASA.
Space.com reporter Hanneke Weitering is now sending updates from Chile, where she will be "chasing totality" on the day of the eclipse, driving 90 miles (150 kilometers) from La Serena to La Silla Observatory in La Higuera.
Viewers in South America will experience totality for about 2.5 minutes, roughly the same duration as the 2017 eclipse that crossed the continental US.
The eclipse will reportedly begin 4,000 km east-northeast of Wellington, New Zealand before eventually making landfall in Chile and crossing through into Argentina. The eclipse won't be visible in India. A major misconception is that you can use sunglasses to look at the sun during an eclipse, however, that is not true.
One should see the eclipse, with the help of telescopes, cameras, binoculars or pinhole projector with approved solar filters.
As always, people are urged to take great care during an eclipse.
If you are in a part of the world where you can directly witness the total solar eclipse or a partial solar eclipse, remember not to see it with naked eyes. It will be visible from most parts of Europe, much of Asia, Australia, Africa, some parts of North America, South America, Atlantic Ocean, Indian Ocean and Antarctica.
A youth tests special binoculars to view tomorrow's total solar eclipse near Central Park in La Higuera, Chile, Monday, July 1, 2019.