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Phases of the Moon, illustration

Phases of the Moon, illustration

C050/7626

Rights Managed

50.0 MB (797.2 KB compressed)

4181 x 4181 pixels

35.3 x 35.3 cm ⏐ 13.9 x 13.9 in (300dpi)

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Phases of the Moon, illustration. As the Moon orbits the Earth, the area that is illuminated appears (from the Earth's surface) to change in size, producing the phases shown on the outer circle. The Moon is always half-illuminated by the Sun. The phases arise because the observer sees more or less of the illuminated side as the angle of observation varies. The Moon rotates so that it always presents the same face to the Earth. It does not have a "dark side" because it is rotating with respect to the Sun. The mean length of the cycle of phases (a lunar or synodic month) is 29.53 days.

Release details

Model release not required. Property release not required.

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