Solar and lunar eclipses happen whenever the Earth, sun and moon line up. Solar eclipses happen at new moon, and lunar eclipses happen at full moon. The alignment has to be just about perfect, otherwise the shadows of the earth or moon never touch down upon the other. This coming summer, August 21st, there will be a total solar eclipse, but you’ll need to travel north or west to see it; from Florida it will appear only as a partial eclipse, which is interesting, but not spectacular. Indian River State College’s Hallstrom Planetarium will present a show about eclipses this weekend.