What is a “neap tide”?
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When the Moon is in its first quarter or last quarter phase, the line between Earth and the Moon is at right angles to the line between Earth and the Sun. As a result, the tidal interaction between Earth and these two solar system bodies do not work together at all, and the difference between high tide and low tide is the smallest for that month during these times. We call tides that occur at these times “neap tides.”