Old instruments
Logarithmic Table
Direct answer
Logarithmic Table is a printed table of logarithms used to turn multiplication and division into addition and subtraction.
Logarithmic Table is a historical calculation table used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Star Catalogue, Astronomical Table, Perpetual Calendar, Almanac Ephemeris
Logarithmic Table is a historical calculation table used in historical astronomy, timekeeping, or navigation.
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The story behind Logarithmic Table
Logarithmic tables became standard equipment for scientific and navigational computation from the seventeenth century onward.
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Why Logarithmic Table matters
Logarithmic Table matters because it greatly reduced the labor of navigation and astronomy calculations before mechanical and electronic computation.
Logarithmic Table in practice: an example
A navigator could add logarithms for trigonometric factors and then take an antilogarithm to obtain a result.
Where readings of Logarithmic Table go wrong
A misplaced decimal or copied digit can create a large error even when the table lookup is correct.
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 logarithmic table?
Logarithmic Table is a printed table of logarithms used to turn multiplication and division into addition and subtraction.
What do people get wrong about a logarithmic table?
A misplaced decimal or copied digit can create a large error even when the table lookup is correct.
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