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Noun [edit]. neap tide â(plural neap tides). 1  The tide which occurs just after the first and third quarters of the moon, when there is least difference between high tide and low tide. 2  Spring tides occur when the Sun and Moon line up, since the gravities of the two bodies add together to create larger tidal forces.
Feb 22, 2016. About every two weeks. Neap tides occur when the gravitational pull of the moon is perpendicular to the gravitational pull of the sun. In the graphic above, we see a month animated. We can see that there are about two spring tides and two neap tides every month, with about a week in between. Read more about Neap and Spring tides here.