Seasons and sky
Tide
Direct answer
Tide: A Tide is a long-period rise and fall of ocean water driven chiefly by the gravitational interaction of Earth, Moon, and Sun and modified strongly by local geography.
A Tide is the recurring rise and fall of ocean level shaped mainly by lunar and solar gravity.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Astronomical Season, Meteorological Season, Equinox, Solstice
A Tide is the recurring rise and fall of ocean level shaped mainly by lunar and solar gravity.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Tide
Coastal communities have tracked tides for navigation, fishing, harbor work, and safety; modern services combine harmonic prediction with observations.
Why Tide matters
Tides connect celestial geometry with real coastal conditions, but local timing and height require station-specific prediction.
Tide in practice: an example
Two nearby bays can experience different tide times and ranges because coastline and seafloor shape the tidal wave.
Where readings of Tide go wrong
A common error is to use a generic lunar rule as a substitute for official tide and hazard information.
Sources and editorial method
Research references used for this entry include:
- 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
Check an official local tide station
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More in Seasons & Earth Almanac
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- Midnight Sun
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- Semidiurnal Tide
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Common questions
What is a Tide?
A Tide is a long-period rise and fall of ocean water driven chiefly by the gravitational interaction of Earth, Moon, and Sun and modified strongly by local geography.
What do people get wrong about a Tide?
A common error is to use a generic lunar rule as a substitute for official tide and hazard information.
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