Old instruments
Tide Table
Direct answer
Tide Table is a schedule of predicted times and heights of high and low water for a stated location.
Tide Table is a predicted water-level table used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Almanac Ephemeris, Agricultural Almanac, Equation of Time Table, Lunar Distance Table
Tide Table is a predicted water-level table used in historical astronomy, timekeeping, or navigation.
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The story behind Tide Table
Printed tide tables brought astronomical tide prediction into ports, navigation, fisheries, surveying, and coastal work.
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The Book of the Sky
How people learned to read the sky, from Babylon to the day you were born.
Why Tide Table matters
Tide Table matters because coastal planning depends on local harmonic predictions rather than a generic statement about the Moon phase.
Tide Table in practice: an example
A harbor table may predict two high waters and two low waters for a civil date.
Where readings of Tide Table go wrong
Wind, pressure, river flow, and storm surge can make observed water levels differ sharply from predictions.
Sources and editorial method
Research references used for this entry include:
- National Geospatial-Intelligence Agency: The American Practical Navigator - Official modern reference for navigation principles, celestial observations, sight reduction, and navigational tables.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Last updated
- 2026-09-26
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Common questions
What is a tide table?
Tide Table is a schedule of predicted times and heights of high and low water for a stated location.
What do people get wrong about a tide table?
Wind, pressure, river flow, and storm surge can make observed water levels differ sharply from predictions.
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