Sky science
Ecliptic Coordinate System
Direct answer
Ecliptic Coordinate System: The Ecliptic Coordinate System measures longitude and latitude relative to the plane of Earth’s orbit.
It maps positions around and away from the ecliptic.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Equatorial Coordinate System, Horizontal Coordinate System, Galactic Coordinate System, Right Ascension Hour
It maps positions around and away from the ecliptic.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Ecliptic Coordinate System
Ecliptic coordinates formalized ancient tracking of the Sun, Moon, and planets.
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The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Ecliptic Coordinate System matters
Ecliptic Coordinate System is especially useful for Solar System motion and zodiacal geometry.
How to read Ecliptic Coordinate System
Specify whether coordinates are geocentric or heliocentric and name the equinox.
Ecliptic Coordinate System in practice: an example
A planet near zero ecliptic latitude lies close to the Sun’s apparent annual path.
Where readings of Ecliptic Coordinate System go wrong
Ecliptic longitude is not altitude, compass direction, or local visibility.
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
Trace motion around the ecliptic
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Common questions
What is the Ecliptic Coordinate System?
The Ecliptic Coordinate System measures longitude and latitude relative to the plane of Earth’s orbit.
What do people get wrong about the Ecliptic Coordinate System?
Ecliptic longitude is not altitude, compass direction, or local visibility.
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