Perigean spring tide
Tide that occurs three or four times per year when the Moon's perigee coincides with a spring tide / From Wikipedia, the free encyclopedia
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A perigean spring tide is a tide that occurs three or four times per year when a perigee (the point nearest Earth reached by the Moon during its 27.3-day elliptic orbit) coincides with a spring tide (when the Sun, the Moon, and Earth are nearly aligned every two weeks).[1] This has a slight but measurable impact on the spring tide, usually adding no more than a couple of inches.[1]