NASA / GSFC-SVS / SCIENCE PHOTO LIBRARY NASA / GSFC-SVS / SCIENCE PHOTO LIBRARY
Waning crescent Moon. The lunar phases arise as the Earth-Moon-Sun angle changes as the Moon orbits the Earth. On a waning Moon, the day-night line (terminator) marks the lunar sunset as night advances over the Earth-facing side of the Moon. The Moon is crescent when it is less than half full. This image, published in 2011, combines data from the Lunar Reconnaissance Orbiter and Clementine spacecraft. The image is part of a sequence of lunar phases (see images C011/1544-1551), orientated for the northern hemisphere. As well as the phases, the sequence also shows variations in the Moon's position and angle.
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