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	Zodiacal Light - LoveToKnow 1911
		ZODIACAL LIGHT, a faint illumination of the sky, surrounding the sun and elongated in the direction of the ecliptic on each side of the sun.
		It is clear that the light proceeds from a region surrounding the sun, and lenticular in form, the axis of the lens being nearly perpendicular to the ecliptic, while the circumference extends at least to the orbit of the earth.
		The hypothesis which best explains all the phenomena is that the light is that of the sun reflected from an extremely tenuous cloud of particles having the form and extent described, and becoming more and more tenuous as the earth's orbit is approached until, immediately outside the orbit, it fades into complete invisibility.
	www.1911encyclopedia.org /Zodiacal_Light (2860 words)

	"Zodiacal Light and the Gegenschein" -- skw9810h
		The zodiacal light and the gegenschein (German for "counter-glow"), which are often easily seen in the tropics, are most readily seen in the morning sky for our latitude in September and October.
		The zodiacal light is a faint, roughly triangular shaped glow of light extending away from Sun.
		The spectrum of the zodiacal light is the same as the solar spectrum, reinforcing the deduction that it is merely sunlight reflected by dust in the plane of the planets.
	www.as.wvu.edu /~jel/skywatch/skw9810h.html (555 words)

	ZODIACAL LIGHT
		The Zodiacal light is visible here as a triangular-shaped cone of light rising on the left side of the photo and stretching to M44, the Beehive cluster, and Mars, which was next to the Beehive when this photo was taken.
		The Zodiacal light is composed of fine particles of dust in orbit around the sun and is visible because of scattered sunlight from the particles.
		Many people confuse the Zodiacal light with twilight since it occurs in roughly the same area of sky, although careful attention to the time of the true end of astronomical twilight will remove any doubt about whether you are seeing the Zodiacal light or the sky brightening from lingering twilight.
	www.astropix.com /HTML/H_OTHER/ZLITE.HTM (520 words)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: 2007-10-02)
		The zodiacal light is a faint, roughly triangular, whitish glow seen in the night sky which appears to extend up from the vicinity of the sun along the ecliptic or zodiac.
		In mid-northern latitudes, the zodiacal light is best observed in the western sky in the spring after the evening twilight has completely disappeared, or in the eastern sky in the autumn just before the morning twilight appears.
		The zodiacal light is produced by sunlight reflecting off dust particles which are present in the solar system and known as cosmic dust.
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Zodiacal_light (519 words)

	APOD: 2004 August 25 - Zodiacal Light and the False Dawn
		Zodiacal dust orbits the Sun predominantly in the same plane as the planets: the ecliptic.
		Zodiacal light is so bright this time of year because the dust band is oriented nearly vertical at sunrise, so that the thick air near the horizon does not block out relatively bright
		Zodiacal light is also bright for people in Earth's northern hemisphere in March and April just after sunset.
	antwrp.gsfc.nasa.gov /apod/ap040825.html (209 words)

	ZODIACAL LIGHT - Online Information article about ZODIACAL LIGHT
		Its light is so faint and diffuse that it is impossible to assign dimensions to it, except to say it covers a region of several degrees in extent.
		It has even been said that observers at great elevations have failed to see the zodiacal light; but it is scarcely credible that this failure could arise from any other cause than not knowing what it was or where to look for it.
		Mercury may be accounted for by the action of that portion of the matter reflecting the zodiacal light which lies nearest to the sun.
	encyclopedia.jrank.org /YAK_ZYM/ZODIACAL_LIGHT.html (3598 words)

	Bortle Light Pollution Scale
		The zodiacal light is still bright enough to cast weak shadows just before dawn and after dusk, and its color can be seen as distinctly yellowish when compared with the blue-white of the Milky Way.
		The zodiacal light is striking in spring and autumn (when it extends 60 degrees above the horizon after dusk and before dawn) and its color is at least weakly indicated.
		The zodiacal light is clearly evident but doesn't even extend halfway to the zenith at the beginning or end of twilight.
	novac.com /light/def.htm (1082 words)

	Gegenschein and Zodiacal Light
		Zodiacal Light is roughly triangular, and points away from the Sun.
		Zodiacal Light might also be observed a couple of hours before dawn, along the ecliptic in the eastern sky.
		The Gegenschein is a faint blob of light in the sky and, like the Zodiacal Light, its spectrum is identical to that of Sun, which again suggests it is sunlight reflected off meteoric dust.
	www.suite101.com /article.cfm/amateur_astronomy/104998 (552 words)

	Science Question of the Week - Watching icebergs - February 22, 2002
		The explanation for the zodiacal light is that meteoric dust particles (sub millimeter or micron size) found in the plane of the solar system scatter sunlight in such a way that it's faintly visible from Earth.
		Zodiacal light is more readily seen at those times of the year when the Sun rises or sets more abruptly - the spring and fall.
		Zodiacal light is sometimes referred to as the afterglow of day or the false dawn.
	www.gsfc.nasa.gov /scienceques2001/20020301.htm (1227 words)

	Telescope Reviews: FAQ: Zodiacal Light
		Zodiacal light is a rather elusive subject, it is often no brighter than the milky way, and can often be mistaken for skyglow, which is why dark skies are necessary.
		The zodiacal light is often a triangular shaped shaft of light extending upwards from the eastern or western horizon.
		Zodiacal light is a very photographic target, but a long exposure will be needed as it is a very faint target as well.
	www.cloudynights.com /ubbthreads/showflat.php/Cat/0/Number/500798/page/149/view/collapsed/sb/9/o/all/fpart/1 (577 words)

	Zodiacal light observations with ISOPHOT (Site not responding. Last check: 2007-10-02)
		The thermal spectrum of the zodiacal light cannot be observed from the ground.
		The observed slight dependence of the temperature of the zodiacal light on ecliptic position will be modelled in the context of the three-dimensional density and temperature distribution of the interplanetary dust cloud.
		Although the zodiacal light is smooth on large scale, little is known on the graininess of its brightness at small spatial scales.
	www.iso.vilspa.esa.es /meetings/paris/Paris_abstracts/node68.html (504 words)

	Zodiacal light (Site not responding. Last check: 2007-10-02)
		For the Spitzer/Spot zodiacal light estimator, we use the DIRBE model for the interplanetary cloud.
		The DIRBE model for scattered light takes the solar spectrum times the phase function times a color correction times a free parameter which is the "albedo." For our purposes, we removed the color correction, and we linearly interpolate between the albedos at 1.25, 2.2, and 3.5 microns.
		The most important difference is that the date that we give to the zodiacal light estimator should really be the "Spitzer date" which lags from the Earth date by approximately 6 days per year into the mission (using a 0.1 AU per year drift rate of Spitzer from the Earth).
	ssc.spitzer.caltech.edu /documents/background/node3.html (1106 words)

	Zodiacal Light (Site not responding. Last check: 2007-10-02)
		Zodiacal light over the PMO Qinghai Radio Observatory near Delingha, Northwest Qinghai, central China, 19 November 1998.
		The morning light is visible as the pyramidical light cone at an angle over the observatory dome.
		This is the most difficult to observe of all Zodiacal Light phenomenon.
	home.wanadoo.nl /marco.langbroek/zodiac.html (543 words)

	Photography techniques: Photographing the zodiacal light
		Since the zodiacal light stretches along the ecliptic, it is best seen (for observers on both hemispheres) during the fall / winter season in the morning before sunrise, and during the spring season after sunset.
		The best months for viewing the zodiacal light are October and November during the morning hours, and March and April during the evening hours, for observers on the northern hemisphere.
		The best pictures (zodiacal light together with the red twilight arch) are obtained at the moment astronomical twilight begins prior to sunrise (ends after sunset), which corresponds to a time window around 90 minutes before sunrise (after sunset), approximately, for middle latitudes.
	www.weatherscapes.com /techniques.php?cat=astronomy&page=zodiacallight (649 words)

	Photography techniques: Photographing the zodiacal light
		Since the zodiacal light stretches along the ecliptic, it is best seen (for observers on both hemispheres) during the fall / winter season in the morning before sunrise, and during the spring season after sunset.
		The best months for viewing the zodiacal light are October and November during the morning hours, and March and April during the evening hours, for observers on the northern hemisphere.
		The best pictures (zodiacal light together with the red twilight arch) are obtained at the moment astronomical twilight begins prior to sunrise (ends after sunset), which corresponds to a time window around 90 minutes before sunrise (after sunset), approximately, for middle latitudes.
	www.weather-photography.com /techniques.php?cat=astronomy&page=zodiacallight (649 words)

	SPACE.com -- Spacewatch Friday: False Dawn: All about the Zodiacal Light
		The Zodiacal Light is caused by an enormous cloud of cosmic dust extending outward from the Sun and past the orbit of the Earth.
		Hence the reason for the name "zodiacal" light, is because it is usually seen projected against the zodiacal constellations, which were conjured by astronomers and poets to fit the ecliptic.
		It may appear ever-so-slightly brighter than the Zodiacal Band because the miniasteroids and meteoroids that reflect the light are on the exact opposite side of the Sun, so individually theyre illuminated in much the same manner as the Moon at full phase.
	www.space.com /spacewatch/zodiacal_light_021101.html (1050 words)

	Museum of Time zodiacal light and comet Ikeya Zang 4 April 2002 Terschelling
		The bright yellow light is sunlight that is reflected against small dust particles that float in the inner solar system.
		It is called zodiacal light because it is concentrated in the plane where the planets (and also Earth) rotate around the sun.
		The apparent closeness of both objects is purely concidental: the light of the comet took less than an hour to reach us while the light of the Andromeda galaxy took more than a million years to reach Earth.
	www.angelfire.com /movies/timelapse/zodiac.html (389 words)

	[No title]
		At certain places far away from city lights, when the sky is clear, a wedge of soft light can be seen pointing toward the place on the horizon where the sun set.
		Zodiacal light, as it is called, lies along the ecliptic plane, or the plane of Earth’s orbit, and is named for this line’s twelve subdivisions - the zodiac.
		Zodiacal light can be seen most easily two hours after sunset at the spring equinox.
	library.thinkquest.org /C003603/english/phenomena/zodiacallight.shtml (238 words)

	Zodiacal Light - Search Results - MSN Encarta
		Zodiacal Light, optical event that appears as a faint glow in the sky in the east before dawn and in the west after dusk.
		The Sun was also found to be encircled by rings of interplanetary dust.
		- faint light in sky: a faint glow in the sky, seen before sunrise to the east and after sunset to the west, and caused by small particles reflected in sunlight
	encarta.msn.com /Zodiacal_Light.html (133 words)

	Zodiacal Light
		This is the zodiacal light, best seen from this hemisphere in the east before dawn at this time of year.
		The zodiacal light was called the "false dawn" in the Rubiyat by Omar Khayyam.
		This is the zodiacal light, best seen from this hemisphere in the evening at this time of year.
	www.noogenesis.com /hsi/zodiacal_light.html (798 words)

	zodiacal light - Encyclopedia.com
		zodiacal light or zodiacal band, a faint band of light sometimes seen in the western sky just after sunset in the spring, extending up from the horizon at the point where the sun has just set, or in the eastern sky just before sunrise in the autumn.
		It is caused by the reflection and scattering of sunlight by a sparse band of tiny dust particles that appears to be an extension of the solar corona, stretching out beyond the orbit of Jupiter.
		Concentrated in the plane of the ecliptic, the faint light is best seen in the region of the sky called the zodiac.
	www.encyclopedia.com /doc/1E1-zodiacal.html (585 words)

	Photographs & Stories of Prairie Wildflowers & Skies
		The light, directly east, was easy to pick out in the pre-dawn darkness.
		However, I found that the Zodiacal light is bright enough that it washes out a lot of detail when using a 50 mm lens with an aperature of 1.4.
		The bright light to the left of the silo and to the right of the top of the barn is the planet Venus.
	www.prairiejournal.com /prairie/zodiacal_light.htm (400 words)

	Observations
		From the observations of the brightness the dependence between concentration of interplanetary dust and distance to the Sun is determined.
		The color is determined by the distribution of intensity of the light in the different wavelengths.
		To a great extend the polarization of the light is due to the electrons from the solar wind.
	zodiacal-light.hit.bg /zl_files/observations_text.html (898 words)

	ARVAL - Luminic Map of Florida
		The zodiacal light, gegenschein, and zodiacal band are all visible - the zodiacal light to a striking degree, and the zodiacal band spanning the entire sky.
		The zodiacal light is a faint glow of light scattered off the zodiacal dust; it can sometimes be seen under very dark sky conditions, along the horizon, either just after dusk or before sunrise.
		The zodiacal band is a faint glow of light scattered off the zodiacal dust; it can sometimes be seen under very dark sky conditions, along the ecliptic.
	www.oarval.org /FL-LP.htm (1323 words)

	What is the zodiacal light? : tonight : Skywatching : Earth & Sky (Site not responding. Last check: 2007-10-02)
		This mysterious light is sometimes called “the false dawn,” but, unlike true dawn, there’s no rosy color to the zodiacal light.
		The zodiacal light is most visible before dawn at this time of year because—as seen from this hemisphere—the ecliptic stands nearly straight up with respect to the eastern horizon before dawn now.
		The zodiacal light is actually sunlight reflecting off dust particles that move in the same plane as Earth and the other planets orbiting our sun.
	www.earthsky.org /skywatching/2006-1018 (302 words)

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