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.

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