Seasons and sky
Perigean Spring Tide
Direct answer
Perigean Spring Tide: A Perigean Spring Tide occurs when new- or full-moon spring-tide alignment falls near lunar perigee, increasing the astronomical tide-generating effect.
A Perigean Spring Tide combines syzygy with a relatively close Moon.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Amphidromic Point, Equinoctial Tide, Astronomical Season, Equinox
A Perigean Spring Tide combines syzygy with a relatively close Moon.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Perigean Spring Tide
Improved lunar ephemerides and tide gauges made the combined phase-distance modulation measurable and predictable.
Why Perigean Spring Tide matters
Perigean Spring Tide can raise predicted high tides and lower predicted lows beyond ordinary spring-tide values at susceptible coasts.
Perigean Spring Tide in practice: an example
A full Moon near perigee may coincide with an unusually large predicted tidal range at a local station.
Where readings of Perigean Spring Tide go wrong
The usual misreading is to equate it automatically with flooding; wind, pressure, waves, coastline, and sea-level anomalies determine impacts.
Sources and editorial method
Research references used for this entry include:
- NOAA Tides and Currents Glossary - Operational definitions for tides, tidal currents, ranges, datums, bores, and amphidromic systems.
- NOAA Ocean Service: What Are Spring and Neap Tides? - Official explanation of lunar-solar alignment and spring and neap tidal ranges.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
Compare perigee with the local tide table
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Common questions
What is a Perigean Spring Tide?
A Perigean Spring Tide occurs when new- or full-moon spring-tide alignment falls near lunar perigee, increasing the astronomical tide-generating effect.
What do people get wrong about a Perigean Spring Tide?
The usual misreading is to equate it automatically with flooding; wind, pressure, waves, coastline, and sea-level anomalies determine impacts.
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