This August 21, 2017, the Sun and moon will align, giving Americans a front row seat to a rare celestial event—a total solar eclipse. Don't miss a moment with the Smithsonian Solar Eclipse app.
Watch a live NASA stream of the eclipse as it travels across the continental United States, calculate your view with our interactive eclipse map, and get a virtual view in our eclipse simulator. While you wait, check out some of the Smithsonian Astrophysical Observatory's solar research and get even closer to the sun with near-live views from space.
The Smithsonian Astrophysical Observatory (SAO) is one part of the Harvard-Smithsonian Center for Astrophysics, where leading astronomers ask, test, and answer some of humanity’s greatest questions.