When it starts, this year's full eclipse will be visible from a narrow arc spanning the Northern Hemisphere.
Its path will begin in Canada and continue northeast across Greenland and the Arctic, then southeast through central Russia, Mongolia, and China.
Before moving east, the eclipse will start over far-northern Canada around 8:30 a.m. Greenwich mean time (or about 4:30 a.m. eastern time). The eclipse will reach totality—when the sun is totally hidden by the moon—in just under an hour.
In a much wider swath of the globe—including northeastern North America along with most of Europe and Asia—people will be able to see a partial eclipse.
Read it all here.