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metal prints moon metal prints lunar metal prints waxing metal prints half metal prints first quarter metal prints 1st metal prints 7 days metal prints astronomy metal prints astronomical metal prints phases metal prints phase metal prints period metal prints periodical metal prints periods metal prints cycle metal prints

photographs moon photos lunar photos waxing photos half photos first quarter photos 1st photos 7 days photos astronomy photos astronomical photos phases photos phase photos period photos periodical photos periods photos cycle photos

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First quarter Moon. Image 7 of 27. Optical image of a waxing (increasing in apparent size) half Moon 7 days into its 28-day cycle (first quarter). 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 waxing Moon the day-night line (terminator) marks the lunar dawn. Taken in September 2001. A sequence of the monthly cycle of Moon phases is shown on images R340/644-670.

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