gloriole		halo, nimbus, aureole.
halo of 22 degrees		the most common halo around the sun or moon.
sundog		a bright spot on a solar halo, often occurring in an opposing pair. (also |parhelion|)
Arc of Lowitz		an arc of light extending diagonally down from a 22-degree parhelion.
antitwilight arch		a pinkish band of light which may appear opposite the setting sun. (also |anticrepuscular arch|.)
parhelic circle		a bright band or circle through the sun and parallel to the horizon.
anthelion		a glow which appears opposite the sun at the same elevation.
zodiacal light		a bright region of the sky near the sun, thought to be sunlight glancing off of meteoric material.
false dawn		zodiacal light seen before the true dawn.
noctilucent cloud		(meteorol.) a type of cirrus-like cloud, seen during summer nights, thought to be meteoric dust high enough to catch the sun.
Hevelian halo		a faint halo at 90o around the sun or moon, attributed to ice crystals.
dark segment		a dark band opposite the rising or setting sun, immediately below the antitwilight arch.
paraselene		(meteorol.) a "mock moon", a brighter spot on a lunar halo.
fogbow		a rainbow formed by fog, appearing as a bright whitish arc.
anticorona		a glow around one's shadow, when it is cast on fog or cloud. (also "glory" or "Brocken bow")
gegenschein		(astron.) a patch of light antipodal to the sun on the zodiacal sphere, formed by sunlight reflecting from interplanetary dust.
heiligenschein		a halo around one's shadow's head.