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Perigean spring tide
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]
- ^ a b "A perigean spring tide occurs when the moon is either new or full and closest to Earth". National Ocean Service. National Oceanic and Atmospheric Administration. July 18, 2013. Retrieved February 2, 2014.
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