During the eclipse on August 21—the first of its kind since 1918—the moon will pass between the sun and Earth, casting a dark shadow and making visible the sun's normally obscured atmosphere.
Observers will be able to see the moon's 70-mile (113-kilometer) wide shadow from Oregon in the west to South Carolina in the east over the course of more than two daylight hours, with two minutes of darkness shadowing 14 states.
