TWILIGHT Often called dusk, it is the evening period of waning light from the time of sunset to dark. The time of increasing light in the morning is called dawn.
Twilight The intervals of incomplete darkness following sunset and preceding sunrise.
Twilight
The average time of civil twilight, which is the time between civil dawn and sunrise in the morning, and between sunset and civil dusk in the evening.
Twister ...
Twilight
An intermediate period of illumination of the sky before sunrise and after sunset; there are three definitions of twilight: civil, nautical, and astronomical.
Typhoon
Maximum wind speed of 64 knots or more.
Twilight The time immediately before sunrise and after sunset when the sky remain illuminated.
Typhoon A hurricane that forms in the western Pacific Ocean.
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Twilight (including civil, nautical, and astronomical) An enquiry from my adult evening class at the University prompted this selection.
antitwilight arch"A bright wedge of pink, orange, or purple light that extends around the antisolar horizon during clear twilights and that has the greatest vertical width (∼3°-6°) occurring above the antisolar point.
CIVIL TWILIGHT The time between the moment of sunset, when the sun's apparent upper edge is just at the horizon, until the center of the sun is 6° directly below the horizon. Related term: twilight ...
Twilight is another phenomenon which is a period of incomplete darkness following sunset (evening twilight) or preceding sunrise (morning twilight).
NAUTICAL TWILIGHT The time after civil twilight, when the brighter stars used for celestial navigation have appeared and the horizon may still be seen.
However, during twilight it may be impossible to use the ceiling projector and then a pibal (pilot balloon) light may be used. This is a simple flashlight bulb attached to a battery.
Wavy, thin clouds that are seen at twilight in polar regions. They form at altitudes of 80-90 km and are made visible by sunlight reflecting off the underside of the cloud.
Nocturnal
Related to night-time, or occurring at night.
The name crepuscular means "relating to twilight" and these rays are observed at sunrise and sunset.
Rainbows
Moonbows
Heavenly Shades of Nighttime Falling, It's Twilight Time
Mirages: A Primer
The Inferior Mirage: Not Just For Deserts Anymore
The Superior Mirage: Seeing Beyond
Halo! Halo!
Sun Dogs
The 46-Degree Halo
Light Pillars ...
Noctilucent Clouds Wavy, thin, bluish-white clouds that are best seen at twilight in polar latitudes. They form at altitudes about 80 to 90 km above the Earth's surface.
Noctiphobia The fear of the night.
Wavy, thin, bluish-white clouds that are best seen at twilight in polar latitudes. They form at altitudes about 80 to 90 km above the surface.
Nocturnal inversion(6)
See Radiation inversion.
Crepuscular rays: Beams of light from the sun caused by a combination of shadows and scattering. These light and dark bands usually occur at twilight.
Cryosphere: The part of the planet Earth covered with permanent ice.
Crepuscular rays Alternating light and dark bands of light that appear to fan out from the sun's position, usually at twilight.
At this time, objects are no longer distinguishable.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Astronomical Dusk, Civil Dusk, Dusk, EVE, Horizon, Nautical Twilight, Sunrise, Sunset ...
of the atmospheric refraction from the adopted value (34') and because of a difference in height of the observer and the actual horizon. 2. Contraction for "time of sunrise," which is defined by the U.S. Naval Observatory. See also twilight; ...
 See also: Light, Air, Atmosphere, Cloud, Clouds
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