 Perigean spring tide

A proxigean spring tide (also known as a perigean spring tide) is a tide that occurs three or four times per year when a perigee (the point nearest Earth that the Moon reaches 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).This tide usually adds only a couple of inches to normal spring tides.