That’s how long ago the previous coast-to-coast solar eclipse was last seen in the U.S. There will be another total solar eclipse in July 2019, but it will be visible only in parts of Argentina and Chile. The truth is, eclipses aren’t all that rare. “Total solar eclipses occur every two years,” says Nye, author of the just-released Everything All at Once. “They come in pairs. They’re more frequent than presidential elections!” Most are visible only to relatively few people or from places where many people can’t easily go—remote mountaintops, the middle of an ocean, unpopulated areas hundreds or thousands of miles away from anything else. That makes the 2017 eclipse extra special.