Tomorrow, 7.5 million people will crowd a 70-mile-wide, 2800-mile-long strip of land as the moon blocks the sun’s light for somewhere around two minutes. The sky will turn dark, several million-degree solar corona will become visible, and the stars will appear in the middle of the day. All that is, of course, if it’s clear out. “It might get cloudy, even in the driest place,” Angela Speck, Director of Astronomy at the University of Missouri told Gizmodo. But have no fear.