Astronomer Stephen Edberg captured this sequence of the full moon as it enters Earth's shadow and then is completely covered by it on August 28, 2007. The moon's passes through nearly the same portion of Earth's shadow during the total lunar eclipse on April 14-15, 2014 but the coloring may be different. A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. When the Moon travels completely into the Earth's umbra, one observes a total lunar eclipse.