Tourists and scientists are gathering at spots around the world for a total solar eclipse Wednesday that will sweep northeast from Brazil to Mongolia, blotting out the Sun across swathes of of the world’s poorest lands.

Day will turn briefly to dark twilight in the eclipse’s path as the Moon comes between the Earth and the Sun.

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WATCH IT LIVE

NASA TV will carry the eclipse live from 5 a.m. to 6:12 a.m. Eastern on March 29.