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wood prints moon wood prints lunar wood prints waning wood prints crescent wood prints 24 days wood prints astronomy wood prints astronomical wood prints phases wood prints phase wood prints period wood prints periodical wood prints periods wood prints cycle wood prints cyclical wood prints cycles wood prints

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Waning crescent Moon. Image 24 of 27. Optical image of a waning (decreasing in apparent size) crescent Moon 24 days into its 28-day cycle. The lunar phases arise as the Moon's orbit of the Earth shows the Earth-facing side moving into and out of the light of the Sun. This Earth-facing side of the Moon is locked in place by the gravitational influence of the Earth. This results in a lunar day that equals the length of the lunar Earth orbit. On a waning Moon the day-night line (terminator) marks the lunar sunset. The Moon is crescent when it is less than half full. Taken in October 2001. A sequence of the monthly cycle of Moon phases is shown on images R340/644-670.

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