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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.
Tides exist thanks to the gravitational pull of the moon and the sun, but vary depending on where the moon and sun are in relation to the ocean as the earth rotates on its axis. The moon and sunâs pull cause two bulges or high tides in the ocean on opposite sides of the earth. The moon, being so much closer, has more power to pull the tides than the sun and therefore is the primary force creating the tides.