Old instruments
Star Sight
Direct answer
Star Sight is a timed angular observation of a navigational star above a visible or artificial horizon.
Star Sight is a stellar altitude observation used in historical astronomy, timekeeping, or navigation.
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At a glance
- Found in
- Historical Almanacs & Instruments
- Related
- Longitude by Chronometer, Noon Sight, Sun Sight, Moon Sight
Star Sight is a stellar altitude observation used in historical astronomy, timekeeping, or navigation.
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The story behind Star Sight
Star sights became increasingly efficient with selected-star lists, sight-reduction tables, and improved sextants.
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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 Star Sight matters
Star Sight matters because multiple stars at well-spread azimuths can produce a strong fix during twilight.
How to read Star Sight
Read Star Sight by identifying the star, measuring altitude, recording UTC, and applying the correct almanac and altitude corrections.
Star Sight in practice: an example
Three twilight star sights whose position lines cross closely can establish a celestial fix.
Where readings of Star Sight go wrong
Misidentification can create a plausible but false line, so predicted altitude and azimuth must be cross-checked.
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.
- U.S. Naval Observatory: Astronomical and Navigational Almanacs - Official descriptions of the Astronomical Almanac, Nautical Almanac, and their tabular data.
- 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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- Astronomical Ephemeris Table
- Compass Rose
- Equatorial Telescope
- Latitude by Meridian Altitude
- Mariner's Astrolabe
- Orrery
- Regulator Clock
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Common questions
What is a star sight?
Star Sight is a timed angular observation of a navigational star above a visible or artificial horizon.
What do people get wrong about a star sight?
Misidentification can create a plausible but false line, so predicted altitude and azimuth must be cross-checked.
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