King tide is a colloquial term for an especially high spring tide, such as a perigean spring tide. "King tide" is not a scientific term, nor is it used in a scientific context.
- A perigean spring tide is a tide that occurs three or four times a year when the Moon's perigee (its closest point to Earth during its 28-day elliptical orbit) coincides with a spring tide (when the Earth, Sun and Moon are nearly aligned every two weeks).
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