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 you're within the path of totality. ➡ Subscribe: http://bit.ly/NatGeoSubscribe #NationalGeographic #SolarEclipse #Educational About National Geographic: National Geographic is the world's 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 what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta Eclipse map adapted with permission: https://www.exploratorium.edu/eclipse Read more in "Solar eclipses, explained" https://on.natgeo.com/2TT6aCc Solar Eclipse 101 | National Geographic htt