Total solar eclipses occur every year or two or three, often in the middle of nowhere like the South Pacific or Antarctic. What makes Monday’s eclipse so special is that it will cut diagonally across the entire United States. The path of totality — where day briefly becomes night — will pass over Oregon, continuing through the heartland all the way to Charleston, South Carolina. Those on the outskirts — well into Canada, Central America and even the top of South America — will be treated to a partial eclipse. The last time a total solar eclipse swept the whole width of the U.S. was in 1918. No tickets are required for this Monday’s show, just special eclipse glasses so you don’t ruin your eyes.