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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]
The largest annual tidal range can be expected around the time of the equinox if it coincides with a spring tide. Spring tides occur at the second and fourth (last) quarters of the lunar phases . By contrast, during neap tides , when the Moon and Sun's gravitational force vectors act in quadrature (making a right angle to the Earth's orbit ...
The dates of spring tides and neap tides, approximately seven days apart, can be determined by the heights of the tides on the classic tide tables: a small range indicates neaps and large indicates springs. This cycle of tides is linked to the phases of the moon, with the highest tides (spring tides) occurring near full moon and new moon.
The tide's range is then at its maximum; this is called the spring tide. It is not named after the season, but, like that word, derives from the meaning "jump, ...
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When does daylight saving time end? Daylight saving time will end 2 a.m. Nov. 3, when clocks will be set back one hour to standard time. U.S. clocks will “spring ahead” for 2025 at 2 a.m. March 9.
Move-in dates, when classes start, fall calendar and more info on the University of Illinois as the 2024-25 academic school year grows near. Move-in dates, when classes start, fall calendar and ...
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