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A total solar eclipse happens somewhere on Earth once every year or two. What is an eclipse? Learn more about how solar eclipses happen, the four types of eclipses, and how to view the sun safely if youre within the path of totality.

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National Geographic is the worlds premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of whats possible.

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Eclipse map adapted with permission: www.exploratorium.edu/eclipse

Read more in "Solar eclipses, explained"

on.natgeo.com/2TT6aCc

Solar Eclipse 101 | National Geographic

youtu.be/cxrLRbkOwKs

National Geographic

www.youtube.com/natgeo