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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.
What Causes the Tides? In this animated interactive, see how the motion of the Earth creates inertial forces that combine with the gravity of the moon and sun to produce ocean tides on our planet. Explore how the relative motion of the Earth, moon, and sun combine to produce ocean tides.