This weekend, stargazers in the Eastern Hemisphere will be treated to an annular solar eclipse on the heels of the summer solstice. Solar eclipses occur about two weeks before or after a lunar eclipse, Young said. How to watchAlthough this isn't a total solar eclipse, you still need to watch the eclipse using safety measures. Whether you use the cardboard eclipse glasses or a handheld card with a single rectangular view, the most important feature is the filter. Millions of Americans used eclipse glasses to safely watch the historic "eclipse of the century."