Eclipse

An eclipse occurs when the view of one celestial body is obscured by the shadow of another celestial body. A solar eclipse occurs when the view of the Sun is obscured by the moon's shadow. A lunar eclipse occurs when the view of the moon is obscured by the Earth's shadow. http://eclipse.gsfc.nasa.gov/eclipse.html

The longest solar eclipse of the 21st century occurred on July 22, 2009, throughout Asia; it lasted for more than six minutes. http://www.cnn.com/2009/WORLD/asiapcf/07/21/solar.eclipse/index.html