What exactly is a solar eclipse?
This page is a basic introduction and explanation of how lunar eclipses take place. It includes a preview to upcoming eclipses of the Moon.
As America prepares for the eclipse on Aug. 21, here are some basic facts about the phenomenon.
Solar eclipses happen when the Moon moves between Sun and Earth, blocking the Sun's rays and casting a shadow on Earth. Check out our animations and map of the annular and total solar eclipse in 2017.