Sky science
Zodiacal Light
Direct answer
Zodiacal Light is a faint triangular glow of sunlight scattered by interplanetary dust concentrated near the ecliptic.
It is sunlight reflected by Solar System dust.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Airmass, Skyglow, Gegenschein, Airglow
It is sunlight reflected by Solar System dust.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Zodiacal Light
Observers recorded the glow for centuries before spacecraft mapped its dust source.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Zodiacal Light matters
Zodiacal Light makes the dust distribution of the inner Solar System visible to unaided eyes.
How to read Zodiacal Light
Seek a dark site after evening twilight or before dawn in favorable seasons.
Zodiacal Light in practice: an example
The cone can rise from the western horizon after dusk when the ecliptic is steep.
Where readings of Zodiacal Light go wrong
It is a mistake to mistake it for city glow, lingering twilight, or the Milky Way.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Night Lights - NASA observing context for zodiacal light, airglow, aurora, and other dim night-sky light.
- NASA Science: Solar System Exploration - NASA overview of planets, moons, small bodies, rings, and the structure of the Solar System.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Look for the dust-lit zodiac
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Common questions
What is Zodiacal Light?
Zodiacal Light is a faint triangular glow of sunlight scattered by interplanetary dust concentrated near the ecliptic.
What do people get wrong about Zodiacal Light?
It is a mistake to mistake it for city glow, lingering twilight, or the Milky Way.
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