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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.
Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).Thurman, H.V. 1994). The effect of distance on tidal generating forces is seen in the relationship between the sun, the moon, and the Earthâs waters. Although the gravitational attraction between the Earth and the Sun is more than 177 times that between the Earth and the Moon, the moon dominates the tides.