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It takes 14 days or 15 days, half of the lunar month of 29.5 days. A full moon has the Moon behind the Earth with respect to the Sun, whereas a new moon has the Moon between the Earth and the Sun, as it orbits Earth. The Moon's orbital period is only 27.3 days, but both the Moon and Earth are revolving around the Sun, which lengthens the time between full illumination (or zero illumination) of the Moon's Earth-facing hemisphere.

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