On August 21, the moon will pass in front of the sun and the sky will turn completely dark in the middle of the day. Total solar eclipses like this occur approximately once every 18 months, but they’re usually only visible from less than half a percent of the Earth’s surface. This will be the first total solar eclipse visible in the United States since 1979.
Despite the brevity of this phenomenon, its rarity makes it an experience stargazers do not want to miss....