zodiacal light

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zodiacal light

The zodiacal light glows faintly above the western horizon after sunset.

Definition
  1. Noun:
    • A faint, diffuse glow of light: A broad, cone-shaped or triangular pillar of faint light that appears in the night sky. It is caused by sunlight scattering off a cloud of interplanetary dust particles that lie in the plane of the Solar System.
Usage
  • Zodiacal light is an astronomical phenomenon best observed in very dark skies, away from city lights.
  • It is most easily seen in the western sky after twilight ends in the evening, or in the eastern sky before twilight begins in the morning.
  • The term is used as a singular, uncountable noun when referring to the phenomenon itself.
Examples
  • From the remote desert, we had a perfect view of the zodiacal light stretching up from the horizon after sunset.
  • Astronomers study the zodiacal light to learn about the distribution of dust within our solar system.
  • The zodiacal light is so named because it appears along the zodiac, the band of constellations through which the sun, moon, and planets appear to travel.
Advanced Usage
  • The Gegenschein (or counterglow): A related, even fainter astronomical phenomenon. It is a faint brightening of the zodiacal light directly opposite the sun in the night sky, caused by backscattering of sunlight from the interplanetary dust.
  • Zodiacal light observations are often discussed in the context of light pollution, as artificial light makes it impossible to see.
Variants and Related Words
  • Zodiacal (adjective): Of or relating to the zodiac or the zodiacal light.
    • The zodiacal dust cloud is responsible for the glow.
  • Gegenschein (noun): The faint, diffuse glow in the night sky opposite the sun, related to the zodiacal light.
Synonyms
  • Diffuse sky glow (in this specific astronomical context).
  • Faint luminous band.
Related Phrases
  • To observe the zodiacal light: To look for and see this phenomenon.
    • Spring is the best season to observe the zodiacal light in the evening.
  • Zodiacal light cone: Describes the shape of the visible glow.
    • The broad base of the zodiacal light cone rests on the horizon.
zodiacal light

The zodiacal light glows faintly above the western horizon after sunset.

Noun
  1. a luminous tract in the sky; a reflection of sunlight from cosmic dust in the plane of the ecliptic; visible just before sunrise and just after sunset