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Topic: Anticrepuscular rays

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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 (321 words)

	Anticrepuscular rays - Wikipedia, the free encyclopedia
		Anticrepuscular rays are similar to crepuscular rays, but seen opposite the sun in the sky.
		Crepuscular rays are usually much brighter than anticrepuscular rays.
		This is because for crepuscular rays, seen on the same side of the sky as the sun, the atmospheric light scattering making them visible is taking place at small angles (see forward scattering).
	en.wikipedia.org /wiki/Anticrepuscular_rays (109 words)

	A brief foray into atmospheric optics - PART I
		Crespuscular rays occur when parallel solar beams are funneled down and redirected through clouds, giving the impression that they are distinct beams emerging from a light source within the cloud and that God is on the verge of speaking.
		Anticrepuscular beams are the tail end of these beams, culminating at their own point of perspective.
		Rays of light carrying the image of the sun are bent at the points of entry to these layers due to changes in composition, pressure and meteorological conditions.
	www.gcrg.org /bqr/6-4/optics.htm (2245 words)

	Anticrepuscular rays
		Crepuscular rays appear to converge on the sun, anticrepuscular rays converge in the opposite direction and you must have your back to the sun or sunset point to see them.
		Like crepuscular rays they are parallel shafts of sunlight from holes in the clouds and their apparently odd directions are a perspective effect.
		Anticrepuscular rays are not rare but they must be sought carefully.
	www.sundog.clara.co.uk /atoptics/anti1.htm (160 words)

	Anticrepuscular rays
		The solar rays, which seem to originate from the Sun when masked by a distant obstacle (a cloud for example), finish to join to the antisolar point (i.e.
		Those rays faintly contrasted cross all the canopy of heaven to converge anew.
		In this snapshot, the anticrepuscular rays are inclined by about 45 degrees.
	www.photoastronomique.net /photo_us.php?nom=dcp_9925 (95 words)

	Outdoor Eyes :: Sunburst Sunset
		Anticrepuscular rays are visible in the sky OPPOSITE the Sun and are seen less often than crepusculars.
		Anticrepuscular rays are actually the continuation of crepuscular rays, projected across our sky and continuing down to the horizon opposite the Sun.
		Anticrepusculars actually mirror the look of the rays nearest the Sun because they are traveling away from us and the perspective makes them look like they are coming up from a point on the horizon when they are actually traveling downward.
	www.outdooreyes.com /phpBB2/viewtopic.php?t=23575 (819 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.
		Anticrepuscular beams appear at the other end of the sky from crepuscular beams.
	news.bbc.co.uk /1/hi/sci/tech/2819553.stm (208 words)

	argus @ acmeme: rainbows and anticrepuscular rays
		First day of fall this morning, in the 10:47 minute UT. (This weblog is set to universal time.) Spaceweather has one of the most beautiful rainbows I've ever seen photographed - so rare to see a sunset rainbow.
		Anticrepuscular rays focus down to the point exactly opposite the sun in the sky sphere, the "antisolar point" (check out the gallery).
		Anticrepuscular rays are common here in Tocantins, Brasil at 10 degrees south latitude.
	www.acmeme.org /blog/archives/000710.html (191 words)

	August 2003 - Anti-solar rays
		Rays of light appear in the sky opposite the direction of sunrise.
		Such rays are called anti-solar rays or anticrepuscular rays.
		Despite appearances, these rays are actually parallel to each other - the apparent convergence is simply an illusion.
	www.well.com /user/wolfy/2003-08/page03.html (61 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)

	APOD: 2001 October 30 - Anticrepuscular Rays Over Colorado (Site not responding. Last check: 2007-11-01)
		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)

	Anticrepuscular rays - Encyclopedia, History, Geography and Biography
		Anticrepuscular rays - Encyclopedia, History, Geography and Biography
		This page was last modified 16:21, 18 April 2006.
		This encyclopedia, history, geography and biography article about Anticrepuscular rays contains research on
	www.arikah.com /encyclopedia/Anticrepuscular_rays (123 words)

	AKM e.V. - Crepuscular Rays (Site not responding. Last check: 2007-11-01)
		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)

	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)

	Earth Science Picture of the Day (Site not responding. Last check: 2007-11-01)
		As the Sun sets or rises, rays of light (crepuscular or twilight rays) interspersed with darker bands (shadows) can sometimes be seen in the direction of the Sun.
		On occasion, these rays can extend all the way across the sky and can be seen opposite the Sun as anticrepuscular rays.
		Both crepuscular and anticrepuscular rays converge toward the horizon.
	epod.usra.edu /archive/epodviewer.php3?oid=90464 (137 words)

	kiwicloudman pix (Site not responding. Last check: 2007-11-01)
		This particular phenomena occurs at the antisolar point in the sky, usually if there are crepuscular rays at sunset there will be anticrepuscular rays, but not always.This display of the rays is especially vivid as it rained earlier on and a clean atmosphere enhanced the rays against the sky.
		The cloud strata catches the last rays of the setting sun,setting the mood for a chilly night.
		This sky and cloud formation is typical of the warm NW wind, the setting sun gives a bronze glow to the underside of the lenticular and arch clouds, especially pronounced in winter.
	canon.pixelcritic.com /folder.php?id=123 (317 words)

	Earth Science Picture of the Day (Site not responding. Last check: 2007-11-01)
		This photograph was taken last month just after sunset in Washington D.C., and it shows one very common phenomenon, congested streets at rush-hour, and another uncommon phenomenon, anticrepuscular rays.
		The traffic is heading east, away from the setting Sun, and the faint anticrepuscular rays can be seen converging at the antisolar point, just below the horizon.
		However, if conditions are right, these same rays can be seen on the opposite side of the sky as well (anticrepuscular rays).
	epod.usra.edu /archive/epodviewer.php3?oid=37120 (238 words)

	Rays - What are cosmic rays? (Site not responding. Last check: 2007-11-01)
		For the most part, the Devil Rays have begun their ‘06 season in That’s Jonny Gomes of your Tampa Bay Devil Rays, proving that his bat is easily among
		Cosmic rays affect satellite electronics and ground-based computer "Solar cosmic rays" (cosmic rays from the sun) originate in the sun's chromosphere.
		The rate at which cosmic rays bombard the Earth varies enormously with their energy.
	intraask.com /itas/rays.htm (234 words)

	crepuscular (Site not responding. Last check: 2007-11-01)
		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.
		Here's an example of anticrepuscular rays looking directly opposite the setting sun.
	www.mmto.org /~swest/atmo/atmo_010.htm (64 words)

	OEDILF - Word Lookup
		It's not unusual to see rays of light (separated by rays of shadow) painted on a hazy sky or on the underside of a cloud layer as the sun is rising or setting.
		These crepuscular (twilight) rays are caused by the shadows of distant clouds.
		Sometimes the shadows carry across the sky, and appear to converge in vanishing perspective on the opposite horizon.
	www.oedilf.com /db/Lim.php?Word=anticrepuscular (161 words)

	Atmospheric Photos by Thad V'Soske - Halos, Rays, Sun Dogs, Rocket Trails
		Subtle anti-crepuscular rays can be seen converging from the upper right corner of the image to a point just left of the full moon.
		Anticrepuscular rays during twilight as seen from Sutherland Reservoir.
		Aside from the over-exposed waxing gibbous moon there are other bright objects in the image.
	www.photosbythad.com /pgs/atmospheric.htm (158 words)

	Keyword (Site not responding. Last check: 2007-11-01)
		In the latest issue of the Astrophysical Journal Letters, scientists argue that a gamma ray burst, the most powerful explosion that occurs in the universe, was responsible for the Ordovican mass extinction in which 60% of all marine invertebrates died.
		Gamma ray bursts are thought to be caused either when two neutron stars collide or when giant stars collapse into fl holes at the end of their lives.
		Cosmic Rays to Solve Ancient Mexican Mystery By John von Radowitz, PA Science Correspondent Sub-atomic particles created by cosmic rays from space are to be used to probe a giant Mexican pyramid and solve one of the world’s greatest archaeological mysteries.
	www.freerepublic.com /focus/keyword?k=rays (1840 words)

	Golden Gate Photo - Sun Ray Gallery Page 2, Fine Art Photography by Geologist/Photographer Cleet Carlton
		Looking west into the Ashdown Gorge Wilderness, with the breaks in the foreground, rays of sunlight make their way between the clouds onto Cedar Valley in the distance.
		This west view across Devil's Cauldron shows Sun rays beaming down behind the Sea Lion Rocks with the sandstone and conglomerate of the Carmelo Formation in the foreground.
		Late afternoon Sun rays shine down on the incised meanders of the San Juan River.
	www.goldengatephoto.com /earthsky/sunray2.html (248 words)

	Anticrepuscular rays and Full Moon
		The Full Moon occur when the Moon is exactly at the opposite of the Sun.
		The anticrépuscular rays are those faint dark rays converging at the opposite of the Sun.
		The Moon isn't Full yet, because it isn't located where those rays converge.
	www.photoastronomique.net /photo_us.php?nom=0507200013 (96 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		These can be seen at sunset or sunrise, and are formed in a similar way, but the shadows being seen are those of clouds or mountains.
		I am not sure if the rays are from clouds or mountains.
		The "rays" are nearly parallel, but those on the opposite side of the sky from the sun seem to converge on the Antisolar Point because of perspective.
	www.svn.net /barryl/MoonPhoto/GG2may96wNotes.html (275 words)

	MORE (Site not responding. Last check: 2007-11-01)
		The clouds had a very nice pink tint since the sun is so low in the sky at this time of year
		Suddenly, I realized I was seeing anticrepuscular rays being created by the cloud directly in front of me!
		I called Nik from her office and we watched them with Nikolai for about 15 minutes - a very interesting phenonema to watch.
	www.the-saga.net /more.php?id=D408_0_1_0_M (106 words)

	APOD: 31 sierpnia 2005 - Crepuscular Rays Over Utah (Site not responding. Last check: 2007-11-01)
		Clouds near the horizon can block sunlight from reflecting off air, making columns outward from the Sun appear unusually dark.
		Cloud shadows can be thought of the complement of the more commonly highlighted
		Sometimes, on the opposite side of the sky, anticrepuscular rays can also be seen.
	orion.pta.edu.pl /apodmain/apod/ap050831.html (113 words)

	Crepuscular rays - Wikimedia Commons
		Crepuscular rays illuminate half the sky - Antarctic sunset
		crepescular rays around the world largest wind generator with 183 m
		This page was last modified 23:58, 20 August 2006.
	commons.wikimedia.org /wiki/Crepuscular_rays (70 words)

	APOD: 2005 August 31 - Crepuscular Rays Over Utah (Site not responding. Last check: 2007-11-01)
		APOD: 2005 August 31 - Crepuscular Rays Over Utah
		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.
	www.phys.ncku.edu.tw /~astrolab/mirrors/apod_e/ap050831.html (120 words)

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