August 15, 2017
NASA illustrates how the alignment of the earth, Moon and Sun create specific conditions leading to a total solar eclipse.
Stories this photo appears in:
Interior Department, NASA offer tips on safely viewing, photographing 'great American eclipse'
When the moon passes in front of the sun on the morning of Aug. 21, it will be the first time a total solar eclipse has passed across the entire length of the United States since 1918.