Dictionary term
Semidiurnal Tide
Direct answer
Semidiurnal Tide: A Semidiurnal Tide is a tidal pattern with two high waters and two low waters of roughly similar height during a lunar day.
A Semidiurnal Tide has two broadly similar highs and lows each lunar day.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Also appears in
- Seasons & Earth Almanac
- Aliases
- None listed
- Last updated
- 2026-07-16
Quick reference
- Use when
- Use Semidiurnal Tide for regional tide classification and local daily scheduling from an official station forecast.
- Do not use it for
- Do not assume exact equal heights or six-hour high-to-low intervals; local constituents and weather modify the curve.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Tidal Datum, Diurnal Tide, Astronomical Season, Equinox
The story behind Semidiurnal Tide
Harmonic analysis explained semidiurnal patterns through strong twice-daily lunar and solar constituents.
Semidiurnal Tide in spiritual tradition
Spiritually, semidiurnal tides can invite attention to repeated coastal rhythm without dictating human behavior.
The Great Almanac frames Semidiurnal Tide with educational restraint. Mystical or symbolic language may be meaningful, but it should not be exaggerated into certainty, panic, or permission to ignore ordinary responsibility.
Semidiurnal Tide in the Bible
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Semidiurnal Tide in numerology
Semidiurnal Tide is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Semidiurnal Tide matters
Recognizing the tidal type helps users interpret prediction tables and expected current reversals.
Example in a reading: Many Atlantic coast locations show approximately twelve-hour spacing between successive high waters.
Interpretive caution: Do not assume exact equal heights or six-hour high-to-low intervals; local constituents and weather modify the curve.
How Semidiurnal Tide is used in a reading
Use Semidiurnal Tide for regional tide classification and local daily scheduling from an official station forecast.
Where interpretation stops
Semidiurnal Tide is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
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.
The page starts with a direct definition, then separates use, example, caution, spiritual meaning, and historical context. For astrology, occult, demonology, curse, and spiritual warfare terms, the editorial rule is to explain the term without making fear-based, fatalistic, medical, legal, financial, or ritual-instruction claims.
Continue learning
Continue into the live sky, space weather, universal timing, and the wider field surrounding the current season.
Open Worldwide WatchRelated terms
These related entries help place Semidiurnal Tide inside a wider reference cluster instead of leaving it as a standalone keyword.
