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	Crepuscular rays - Wikipedia, the free encyclopedia
		Crepuscular rays, in atmospheric optics, also known as sun rays, are rays of sunlight that appear to radiate from a single point in the sky.
		The rays of the second and third types, in some cases, may extend across the sky and appear to converge at the antisolar point, which is the point on the sky sphere directly opposite the sun, and they are called anticrepuscular rays.
		Crepuscular rays are usually red or yellow in appearance because the atmosphere acts as a giant lens, refracting low sunset rays into long curved paths passing through up to 40 times as much air than the rays from a high midday sun.
	en.wikipedia.org /wiki/Crepuscular_rays (325 words)

	Crepuscular - Wikipedia, the free encyclopedia
		Crepuscular is a term used to describe animals that are primarily active during the twilight.
		Crepuscular is thus in contrast with diurnal and nocturnal.
		Within the definition of crepuscular are the terms matutinal and vespertine, denoting animals active in the morning (dawn) and evening (dusk) respectively.
	en.wikipedia.org /wiki/Crepuscular (169 words)

	Crepuscular Rays: sun rays converging on the horizon
		Crepuscular rays appear to diverge outward from the setting sun, and are visible only when the atmosphere contains enough haze or dust particles so that sunlight in unshadowed areas can be scattered toward the observer.
		Crepuscular rays are often red or yellow in appearance because blue light from the sun is selectively scattered out of the beam by air molecules.
		Light rays scattered by dust and haze occasionally appear to converge toward the "antisolar" point, (the location on the horizon opposite the point where the sun is setting).
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/opt/air/crp.rxml (229 words)

	Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		Crepuscular rays are parallel columns of sunlit air looking as if they would diverge because of perspective effects.
		Crepuscular rays sometimes stretch across the whole sky and seem to converge in the antisolar point.
		Crepuscular rays are caused by small airborne particles of dust or tiny droplets of water or even by the molecules themselves which scatter sun- or moonlight.
	www.engl.paraselene.de /html/crepuscular_rays.html (106 words)

	Untitled
		One ray of sky glory common during these months is the brilliant displays of visible solar rays, often tinted red or orange in the twilight hours.
		The highest degree of contrast occurs when the rays are viewed toward or away from the sun rather than when viewed at right angles to the beam, such as when they pass overhead.
		Crepuscular rays are usually red, orange, and yellow in colour because blue light is effectively scattered out by air molecules and very small particles in the sky.
	www.suite101.com /print_article.cfm/science_sky/80760 (784 words)

	Crepuscular Rays
		key component for crepuscular rays is a shadow.
		Also note from the image that the rays become less apparent the farther they are from the solar point.
		iven that crepuscular rays arise from virtually parallel rays of sunlight that are partially blocked by an object, it may seem counterintuitive that they appear to diverge from the solar point.
	www.ems.psu.edu /~demark/471/CrepuscularRays.html (951 words)

	Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		Light from the sun is scattered by the earth's atmosphere, resulting in the blue color of the sky.
		Crepsucular rays occur when the sunlight is intermittently obstructed by clouds, virtually casting a series of shadows.
		Although the rays appear to converge at the sun, they are actually parallel.
	www.astrophys-assist.com /wilobs/weathwin/crepsculr.htm (69 words)

	To See as a Scientist: The Discovery of Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		The streaming rays of sun, personified fingers aching to touch the earth, are known as crepuscular rays.
		Although the sight of crepuscular rays is far more common than the sight of a rainbow, the aesthetic pleasure that is captured by viewing crepuscular rays can be and often is one of beauty and wonder.
		Now the sun rays are not merely sun rays, perhaps divinely inspired, I have moved from the realm of mere speculation to knowledge.
	serendip.brynmawr.edu /sci_cult/courses/beauty/web2/amartin.html (1456 words)

	The Weather Notebook \| Crepuscular Rays and Wedge
		Certainly, you have seen the glorious rays of the sun streaming through the clouds early in the morning or as old Sol edges toward the evening horizon.
		Crepuscular means "twilight," and these are sometimes called "twilight rays." Owls, for example, are considered crepuscular creatures because they are usually spotted as the sun is near the horizon (they actually work all night, but we usually don’t see them then).
		Crepuscular scatterings seem to fan out in wide rays, but that’s only an illusion: light from the sun is coming in, pretty much, parallel lines.
	www.weathernotebook.org /transcripts/2005/01/03.php (346 words)

	Golden Gate Photo - Sun Ray Gallery Page 1, Fine Art Photography by Geologist/Photographer Cleet Carlton
		Crepuscular (meaning of the twilight) rays occur when the Sun lies below the horizon, either after sunset or before sunrise, and may be formed by the Sun peaking around distant clouds or mountains below the horizon, or may even be due to a backscatter of windrows of particles high in the stratosphere.
		Rarely, crepuscular rays can cross the entire sky, merging on the antisolar point (directly opposite the Sun's position) where they are called anticrepuscular rays.
		Although the rays appear to converge at the Sun or antisolar point, they are actually parallel (like railroad tracks appear to converge).
	www.goldengatephoto.com /Earthsky/sunray.html (406 words)

	Sky-wide rays and shadows
		The rays are all parallel to each other, real columns of sunlit and shadowed air.
		The rays in the antisolar direction, are called anti-crepuscular.
		This image shows brilliantly that familiar crepuscular rays and the less well known anti-crepuscular rays are really the same objects.
	www.sundog.clara.co.uk /atoptics/skywide.htm (158 words)

	Crepuscular Rays
		Crepuscular rays can be formed by shadows on thin fog or mist, here the dark hedge provides a good contrast for the sunlit fog.
		Although the rays appear to be diverging to the left it is easy to see that they are really travelling parallel with the narrow lane.
		Because of this perspective and the low sun the illusion of diverging rays is still strong.
	home.clara.net /rfleet/gbh/crepusc3.html (98 words)

	Cloudray photos, crepuscular rays, photos of crepuscular rays, photos of sun beams, photos of sun rays, light rays from ...
		Cloud rays (or Crepuscular rays) are one of the most sought-after sky phenomenon.
		They are the shadows or light rays produced by the sun trying to shine around or through the clouds.
		Some appear as the sun sinks low beneath the clouds on the horizon, projecting alternating rays of sunlight and shadows from cumulus cloud edges, streaming toward you and on over your head.
	www.creations-photos.com /cloudrays.html (369 words)

	Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		Crepuscular rays are beams of light that shine out from behind clouds, trees, windows, or any other object that can cast a shadow.
		These rays are caused when sunlight hits an object that casts a shadow.
		The contrast between the bright and shadowed areas creates forged beams of light that protrude from behind the object casting the shadow.
	snrs.unl.edu /amet351/graf/rays.html (217 words)

	AKM e.V. - Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		When the sun is hidden by a thick cloud, there sometimes appear dark, fan-shaped rays emanating from the cloud.
		The shadow rays are only visible when the atmosphere contains lots of small water droplets or dust particles.
		When the sun is very low near the horizon or has just sat, the light and shadow rays can extend over the whole sky (crepuscular rays) and converge at the antisolar point (anticrepuscular rays).
	www.meteoros.de /strahl/strahle.htm (175 words)

	AMS Glossary
		—(Also called shadow bands.) Literally “twilight rays,” these alternating dark and light bands (shadows and light scattered from sunbeams, respectively) seem to diverge fanlike from the sun's position during twilight.
		Crepuscular rays may appear as 1) shadows cast across the purple light by high, distant cloud tops or 2) shadows next to light scattered from sunbeams by haze in the lower atmosphere.
		Sunbeams seen during the day are sometimes called crepuscular rays, even though they are observed outside twilight.
	amsglossary.allenpress.com /glossary/search?id=crepuscular-rays1 (117 words)

	Anti Crepuscular Rays (Site not responding. Last check: 2007-10-13)
		This image was photographed soon after sunset on Dec. 31, 2003 looking away from the sun at 5:39 pm from the author's home near Asheville, NC.
		The dark rays are shadows caused by mountain peaks or clouds in the distance behind the camera.
		The convergence of the parallel rays is analogous to the convergence of parallel railroad tracks in the distance.
	warren-wilson.edu /~physics/Photo_Sky_optical/2Solstices/Shadows.htm (212 words)

	BBC NEWS \| Science/Nature \| Strange rays seen over Horseshoe Canyon
		Although the Sun's rays strike the Earth almost parallel to one another, we see them appear to come from a point because of perspective - because at a distance, parallel lines seem to converge, like railway lines disappearing over the horizon.
		So-called crepuscular rays are the rays that appear when parallel solar beams are redirected through clouds and appear to diverge.
		Sometimes when crepuscular beams are visible, they can cover the entire sky.
	news.bbc.co.uk /2/hi/science/nature/2819553.stm (200 words)

	Anticrepuscular Rays Over Colorado
		To understand them, start by picturing common crepuscular rays that are seen any time that sunlight pours though scattered clouds.
		At the anti-solar point 180 degrees around from the Sun, they are referred to as anticrepuscular rays.
		Pictured above is a particularly striking set of anticrepuscular rays photographed earlier this month from a moving car just outside of Boulder, Colorado, USA.
	www.astronet.ru /db/xware/msg/1199899 (144 words)

	Cloud Shadow Images
		Sun rays, also called crepuscular rays, streaming through gaps in clouds are parallel columns of sunlit air separated by darker cloud shadowed regions.
		The rays appear to diverge because of perspective effects, like the parallel furrows of freshly ploughed fields or a road wide at your feet yet apparently narrowing with distance.
		Airborne dust, inorganic salts, organic aerosols, small water droplets and the air molecules themselves scatter the sunlight and make the rays visible.
	www.sundog.clara.co.uk /atoptics/ray1.htm (74 words)

	Pictures of Green Flashes
		Also, crepuscular rays have angular lengths of tens of degrees, while an ordinary green flash is always smaller than the size of the Sun (half a degree), and usually only just above the resolution threshold of the eye — a few minutes of arc.
		Such rays are usually caused by the shadows of clouds or distant mountains, often just over the horizon, cast on the hazy lower atmosphere.
		It shows some (relatively weak) crepuscular rays, as well as a piece of sky near the Sun that appears quite greenish at first glance — though if you mask it off, you can see it's really a greenish yellow, and the perceived green is mostly due to simultaneous contrast with the purple arc above it.
	mintaka.sdsu.edu /GF/pictures.html (3771 words)

	Crepuscular rays
		Crepuscular comes from the Latin crepusculum, which means twilight.
		Crepuscular rays can appear when the clouds (or terrain) that are responsible for the rays are below the horizon.
		The so-called crepuscular rays are solar rays cast on the purple red, while the sun is below the observer's horizon, and sometimes span the entire twilight sky towards the Earth's shadow band (the twilight wedge).
	www.weather-photography.com /album.php?cat=optics&subcat=crepuscular_rays (122 words)

	TB Stumper Answers: 24 January 2003 - Sunbeams and God Light
		We see the light rays because of the shadows, and we see the shadow rays because of the light.
		Crepuscular rays converge and diverge in the same way, and you can also follow the lines in my photos above.
		Here are some discussions of crepuscular rays on the Web, starting with a fine short account by Tony Demark.
	www.rain.org /~mkummel/stumpers/24jan03a.html (1223 words)

	APOD: 2001 October 30 - Anticrepuscular Rays Over Colorado (Site not responding. Last check: 2007-10-13)
		Although the scene may appear somehow supernatural, nothing more unusual is occurring than a setting Sun and some well placed clouds.
		crepuscular rays that are seen any time that sunlight pours though scattered clouds.
		crepuscular rays from a setting (or rising) sun will appear to re-converge on the other side of the sky.
	antwrp.gsfc.nasa.gov /apod/ap011030.html (132 words)

	Rays and Shadows - Atmospheric Optics
		Dust, small aerosols and moisture droplets scatter light to make the sun's rays visible and cloud and mountain shadowed air dark by comparison.
		Air and very small particles scatter colours selectively to paint the blues of skies and fires of sunsets.
		Air at varied temperatures and densities refracts the rays of setting suns and moons to fashion fantastic shapes and green flashes.
	www.atoptics.co.uk /rayshad.htm (73 words)

	crepuscular (Site not responding. Last check: 2007-10-13)
		Perspective effects make the light that peeks through the shadows appear to eminate from the solar point.
		Anticrepuscular rays again are parallel cloud shadows that streak across the sky to the opposite horizon and appear to eminate from the anti-solar direction.
		One shaft of light is reflecting from a pool of water.
	www.mmto.org /~swest/atmo/atmo_010.htm (64 words)

	APOD: 2005 August 31 - Crepuscular Rays Over Utah (Site not responding. Last check: 2007-10-13)
		Dark sky rays were caught in spectacular fashion earlier this month above Kanab, Utah,
		crepuscular rays, also visible above, where sunlight pours though cloud holes.
		Sometimes, on the opposite side of the sky, anticrepuscular rays can also be seen.
	antwrp.gsfc.nasa.gov /apod/ap050831.html (121 words)

	\| nswstorms.com - Crepuscular rays at sunrise - Wollongbar, NSW - 7 January 2003 \|
		nswstorms.com - Crepuscular rays at sunrise - Wollongbar, NSW - 7 January 2003
		Crepuscular rays at sunrise - Wollongbar, NSW - 7 January 2003
		No images are within the public domain and use of any photograph or image as the basis for another photographic concept or illustration is a violation of copyright.
	www.nswstorms.com /galleries/degalleries/galleryimages/photos/2003/0107de01.html (87 words)

	Crepuscular rays
		Before sunset you often see the sun rays opening the sky in a top-to-bottom effect.
		This unusual ray formation is just at sunset, but without any visible clouds in the sky.
		Note how different shades of pink and blue are displayed upwards from where the sun is located just under the horizon.
	chitambo.com /clouds/cloudshtml/crepuscular.html (151 words)

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