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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.
When do spring tides occur? Spring tides occur twice each month all year long. Interestingly, when there is a full or new moon â the average tidal ranges are larger. Why do spring tides happen? When there is a new and full moon, the gravitational pull of the sun is supplemented to the gravitational pull of the moon on Earth.