JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Waning crescent Moon. As the Moon orbits the Earth, the amount of sunlight on its visible hemisphere varies in a regular 28-day cycle. This is a waning crescent Moon, 24 days into the cycle. As the cycle progresses, darkness encroaches (from left) as the lunar night falls. Photographed in the southern hemisphere.
Model release not required. Property release not required.