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.