Dictionary term
Precession Table
Direct answer
Precession Table is a table of corrections used to carry celestial coordinates between epochs as Earth's rotation axis slowly changes direction.
Precession Table is a coordinate-epoch conversion table used in historical astronomy, timekeeping, or navigation.
Precession Table is a coordinate-epoch conversion table used in historical astronomy, timekeeping, or navigation.
An engraved functional orientation; the page explains the real instrument, method, or publication.Quick reference
- Use when
- Use Precession Table by applying the published precession model in the correct direction and treating proper motion separately.
- Do not use it for
- Precession does not include every source of motion; proper motion, nutation, aberration, and measurement error may also matter.
- Reference category
- Historical Almanacs & Instruments
- Related terms
- Meridian Table, Transit Table, Declination Table, Right Ascension Table
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The story behind Precession Table
Precession tables allowed catalogue and navigation work to update coordinates long before software performed the transformation.
Precession Table in spiritual tradition
Precession Table rewards careful observation, explicit assumptions, and humility about the limits of every model or measurement.
Precession Table: fact and faith, kept distinct
This is a factual history-of-science, instrument, timekeeping, or navigation reference. It may support wonder and disciplined attention without becoming a claim of fate, worship, or private revelation.
Precession Table in numerology
Precession Table is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Precession Table matters
Precession Table matters because catalogue positions must share an epoch before they can be compared or pointed accurately.
Precession Table at work: an example
A nineteenth-century star position can be precessed toward a modern reference epoch before plotting.
Where interpretation stops
Precession Table is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
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.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Also appears in
- Historical Almanacs & Instruments
- Aliases
- None listed
- Last updated
- 2026-07-16
Explore Precession Table
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Common questions
What is Precession Table?
Precession Table is a table of corrections used to carry celestial coordinates between epochs as Earth's rotation axis slowly changes direction.
How is Precession Table used in an almanac?
Use Precession Table by applying the published precession model in the correct direction and treating proper motion separately.
What should I avoid when interpreting Precession Table?
Precession does not include every source of motion; proper motion, nutation, aberration, and measurement error may also matter.
