Old instruments
Celestial Position Fix
Direct answer
Celestial Position Fix is a position obtained from the intersection of two or more independent celestial lines of position.
Celestial Position Fix is a multi-sight celestial position used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Marcq Saint-Hilaire Method, Line of Position, Running Fix, Local Hour Angle
Celestial Position Fix is a multi-sight celestial position used in historical astronomy, timekeeping, or navigation.
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The story behind Celestial Position Fix
Celestial fixes became standard chartwork products once reliable sights, time, and reduction methods converged.
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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 Celestial Position Fix matters
Celestial Position Fix matters because well-spread observations turn separate one-dimensional constraints into a practical estimated location.
How to read Celestial Position Fix
Celestial Position Fix by combining sights close enough in time or advancing them consistently speaks to vessel motion.
Celestial Position Fix in practice: an example
Three star lines forming a small triangle can be assessed together to choose the most probable fix.
Where readings of Celestial Position Fix go wrong
A tight intersection can still be biased by a shared clock, index, horizon, or plotting error.
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 Celestial Position Fix?
Celestial Position Fix is a position obtained from the intersection of two or more independent celestial lines of position.
What do people get wrong about Celestial Position Fix?
A tight intersection can still be biased by a shared clock, index, horizon, or plotting error.
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