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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.
Because of this, high and low tides are about 50 minutes later every day. The Sun Tide. The tides are caused mainly by the gravitational attraction of the moon and the earth, but there is also a gravitational attraction between the earth and the sun.The effect of the sun upon the tides is not as significant as the moons effects.t is actually the gravitational attraction of the sun and moon that cause waters of the ocean to swell and recede at different parts of the earth. The Moon Tide. The earth and the moon are two great masses that have a significant gravitational pull on each other.