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Approximately 7.3825 days. That is one quarter of the synodic period of 29.53 days for the moon to go from one phase to the next same phase. Spring tide is when the Sun, Earth, and Moon are lined up with each other, and the Sun's and Moon's gravities maximally reinforce each other, and neap tide is when they form an angle of 90 degrees, with the Earth at the vertex, and the Sun's and Moon's gravities maximally cancel each other out.

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14y ago

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