Old instruments
Equation of Time Table
Direct answer
Equation of Time Table is a table showing the changing difference between apparent solar time and mean solar time through the year.
Equation of Time Table is a solar-time correction table used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Agricultural Almanac, Tide Table, Lunar Distance Table, Star Atlas
Equation of Time Table is a solar-time correction table used in historical astronomy, timekeeping, or navigation.
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The story behind Equation of Time Table
Equation-of-time tables were printed on dials, calendars, observatory references, and navigation manuals.
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Why Equation of Time Table matters
Equation of Time Table matters because it explains why a sundial and a uniform clock can disagree even when both are functioning correctly.
Equation of Time Table in practice: an example
A reader may add or subtract the listed November correction when comparing a sundial with a clock.
Where readings of Equation of Time Table go wrong
Different publications reverse the sign, so read the heading instead of assuming add or subtract.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical and Navigational Almanacs - Official descriptions of the Astronomical Almanac, Nautical Almanac, and their tabular data.
- 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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More in Historical Almanacs & Instruments
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Common questions
What is Equation of Time Table?
Equation of Time Table is a table showing the changing difference between apparent solar time and mean solar time through the year.
What do people get wrong about Equation of Time Table?
Different publications reverse the sign, so read the heading instead of assuming add or subtract.
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