Halo (optical phenomenon)
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Halo (from Greek Template:Lang, halōs) is the name for a family of optical phenomena produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky. Many of these appear near the Sun or Moon, but others occur elsewhere or even in the opposite part of the sky. Among the best known halo types are the circular halo (properly called the 22° halo), light pillars, and sun dogs, but many others occur; some are fairly common while others are (extremely) rare.
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See also
- 22° halo
- 46° halo
- 120° parhelion
- Anthelion
- Atmospheric optics
- Circumhorizontal arc
- Circumscribed halo
- Circumzenithal arc
- Corona
- Diamond dust
- False sunrise
- Glory
- Green flash
- Heiligenschein
- Infralateral arc
- Kern arc
- Light pillar
- Liljequist parhelion
- Parhelic circle
- Parry arc
- Rainbow
- Subhelic arc
- Subparhelic circle
- Subsun
- Sun dog
- Supralateral arc
- Upper and lower tangent arcs
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