The total solar eclipse on August 21 will be the first time many Americans will directly see the moon entirely blocking out the disc of the sun. But with our animation you can catch an early preview of the "Great American Eclipse."
Zooming out from the earth's surface, we pan over to the moon in orbit. As the moon slides in front of the sun, it appears as if our lunar satellite is taking larger and larger cookie bites out of the fiery solar surface.
Altering our perspective, the view swings around to reveal how the moon casts its shadow on earth: both the 'penumbra' (the zone of partial shadow) and the 'umbra' (the zone of complete shadow). The eclipse shadow makes first contact in the Pacific Ocean. Zooming in on North America, the eclipse shadow races eastward, to make landfall in the Pacific Northwest.
As the solar eclipse passes over the country, cities across the nation will see the sun obscured to a degree and from an angle unique to their location. As the eclipse shadow heads off into the Atlantic Ocean, full light returns to the country.
Catch more eclipse coverage from KQED Science:
Eclipse Scientists Probe the Mysteries of the Sun’s Atmosphere
Where to Watch the Eclipse in the Bay Area
California’s Grid Prepares for Solar Power to Be Eclipsed
You Know About This Summer’s Spectacular Solar Eclipse, Right?
Don’t Be in the Dark: Answers To Your Burning Questions About the August Eclipse
Help Make History: Eclipse Projects for Citizen Scientists
Americans Prepare for First Coast-to-Coast Total Solar Eclipse in Century (Forum)