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neap tide
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The video thumbnail image shows a graphic of the Earth with two tidal bulges. Blue arrows point to the bulges against a white background.
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neap tide

physics
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tide
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The video thumbnail image shows a graphic of the Earth with two tidal bulges. Blue arrows point to the bulges against a white background.
How does the Moon affect the tides?The Earth may be less spherical and more football-shaped than you thought.
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neap tide, tide of minimal range occurring near the time when the Moon and the Sun are in quadrature. This condition is geometrically defined as the time at which the line from the Earth to the Moon is at right angles to the line from the Earth to the Sun. Thus, the tide-producing effects of the Sun and the Moon cancel each other, and tidal ranges are usually 10 to 30 percent less than the mean tidal range. See also tide.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Meg Matthias.