Sky science
Declination Circle
Direct answer
Declination Circle: A Declination Circle is a great circle through both celestial poles and a chosen sky position.
It is the pole-to-pole circle used to measure declination.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Galactic Coordinate System, Right Ascension Hour, Celestial Meridian, Local Meridian
It is the pole-to-pole circle used to measure declination.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Declination Circle
Classical positional instruments physically embodied declination and hour circles.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Declination Circle matters
Declination Circle supplies the geometric path from the equator to an object’s declination.
Declination Circle in practice: an example
A star and both celestial poles lie on the star’s declination circle.
Where readings of Declination Circle go wrong
A common error is to confuse this constructed circle with an object’s daily track.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical Almanac Glossary - Definitions for astronomical coordinates, time, reference systems, and observable phenomena.
- International Astronomical Union: Standards of Fundamental Astronomy - IAU-maintained standards and algorithms for astronomical reference systems and coordinate transformations.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Follow a declination circle
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Common questions
What is a Declination Circle?
A Declination Circle is a great circle through both celestial poles and a chosen sky position.
What do people get wrong about a Declination Circle?
A common error is to confuse this constructed circle with an object’s daily track.
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