Old instruments
Astronomical Ephemeris Table
Direct answer
Astronomical Ephemeris Table is a dated table of computed positions or circumstances for celestial bodies and events.
Astronomical Ephemeris Table is an astronomical reference 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, Almanac, Nautical Almanac
Astronomical Ephemeris Table is an astronomical reference table used in historical astronomy, timekeeping, or navigation.
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The story behind Astronomical Ephemeris Table
Printed ephemeris tables became essential working tools for observatories, navigators, calendar makers, and almanac editors.
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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 Astronomical Ephemeris Table matters
Astronomical Ephemeris Table matters because it preserves the numerical steps behind a sky prediction and lets observers work without recalculating an orbit from scratch.
Astronomical Ephemeris Table in practice: an example
A lunar ephemeris row may give geocentric right ascension and declination at a stated Universal Time.
Where readings of Astronomical Ephemeris Table go wrong
The usual misreading is to mix editions, time scales, coordinate epochs, or geocentric and topocentric values.
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.
- U.S. Naval Observatory: Astronomical Applications Data Services - Authoritative services for positions, rise and set data, phases, seasons, eclipses, and astronomical dates.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Last updated
- 2026-09-26
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Common questions
What is Astronomical Ephemeris Table?
Astronomical Ephemeris Table is a dated table of computed positions or circumstances for celestial bodies and events.
What do people get wrong about Astronomical Ephemeris Table?
The usual misreading is to mix editions, time scales, coordinate epochs, or geocentric and topocentric values.
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