Sky science
Ecliptic
Direct answer
Ecliptic: The Ecliptic is the Sun's apparent annual path across the celestial sphere and the projection of Earth's orbital plane onto the sky.
The Ecliptic is the Sun's apparent yearly path and Earth-orbit plane projected on the sky.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Astronomy, Skywatching, Celestial Sphere, Altitude and Azimuth
The Ecliptic is the Sun's apparent yearly path and Earth-orbit plane projected on the sky.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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What sets Ecliptic apart
The ecliptic is a line, not a body: the track the Sun seems to follow against the stars in the course of a year, tilted to the celestial equator by about 23.4 degrees. It crosses the equator twice, at the two equinoxes, and reaches its farthest north and south at the solstices. Zodiac longitude is measured along it, from 0 degrees at the March equinox point to 360, and it takes its name from eclipses, which can happen only when the Moon stands on or near this line.
- Tilt to the equator: about 23.4 degrees, called the obliquity of the ecliptic
- Sun along it: about 1 degree a day, 360 degrees in a tropical year of 365.24 days
- Zodiac measure: twelve signs of 30 degrees, counted from the March equinox point
- Coordinates: ecliptic longitude runs 0 to 360, ecliptic latitude north or south of the line
- Moon's path: inclined about 5.1 degrees to it, so the Moon crosses the line twice a month
Often mistaken for something else: The celestial equator is the sky above the equator of the world, a different circle; the two meet at only two points, the equinoxes.
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The story behind Ecliptic
Ancient observers recognized the Sun's yearly route among the stars; later geometry connected that route with Earth's orbit.
Why Ecliptic matters
The Ecliptic organizes much of the visible solar-system sky. The Moon and planets usually appear near it because their orbital planes are relatively close to Earth's.
Ecliptic in practice: an example
A sky map can draw the ecliptic through the zodiac constellations so readers know where to scan for planets.
Where readings of Ecliptic go wrong
The usual misreading is to confuse the ecliptic with the celestial equator or with a physical track in space.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Astronomical Almanac Glossary - Reference definitions for astronomical coordinates, events, calendars, and time scales.
- U.S. Naval Observatory: Astronomical Information Center - Official index for time, calendars, seasons, coordinates, and observable sky phenomena.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
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Common questions
What is the Ecliptic?
The Ecliptic is the Sun's apparent annual path across the celestial sphere and the projection of Earth's orbital plane onto the sky.
What do people get wrong about the Ecliptic?
The usual misreading is to confuse the ecliptic with the celestial equator or with a physical track in space.
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