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The Moon waxes( grows from crescent to full) and then Wanes ( from full to crescent) every 28 1/2 days. The Moon is lit by the Sun and the Earth is often between the two causing the Earth to partially shadow the Moon's surface . Every evening a larger and larger portion of it is illuminated by the Sun until you see it as a Full Moon. The Shadow of the Earth now starts to shadow or 'occult' the moon from the opposite side until in complete shadow of the Earth. A New Moon appears a few days later.

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15y ago

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