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Topic: Eclipse Penumbra

	Eclipse - Wikipedia, the free encyclopedia
		An eclipse (Greek verb: ekleipô, "to vanish", though it may derive from the prefix 'ex-', "away from", and Greek 'kaluptein', "to conceal") is an astronomical event that occurs when one celestial object moves into the shadow of another.
		For solar eclipses, the viewer is in the penumbra part of the Moon's shadow.
		The ratio between the apparent sizes of the eclipsing body and that of the luminary is called the magnitude of the eclipse.
	en.wikipedia.org /wiki/Eclipse (1394 words)

	Lunar eclipse - Wikipedia, the free encyclopedia
		At a total penumbral eclipse the Moon is completely in the penumbra of the Earth, but not in the umbra.
		For an eclipse to occur, the Moon must be near its orbital node —the intersection of the orbital planes.
		The eclipse on May 15 grazed the northern edge of the earth's shadow, and the eclipse on November 8 grazed the southern edge.
	en.wikipedia.org /wiki/Lunar_eclipse (957 words)

	SPACE.com -- Viewer's Guide: Oct. 27 Total Lunar Eclipse
		The penumbra is the pale outer portion of the Earth's shadow.
		Although the eclipse begins officially at this moment, this is in essence an academic event.
		The partial phases of the eclipse begin; the pace quickens and the change is dramatic.
	www.space.com /spacewatch/041022_eclipse_guide.html (1514 words)

	NASA TP 2004-212762: Chapter 1
		Bisectting the "eclipse begins and ends at sunrise and sunset" loops is the curve of maximum eclipse at sunrise (western loop) and sunset (eastern loop).
		Northern and southern limits of the penumbra may be thought of as curves of constant magnitude of 0.0, while the adjacent curves are for magnitudes of 0.2, 0.4, 0.6, and 0.8.
		The eclipses occur at the same node with the Moon at nearly the same distance from Earth and at the same time of year, thus, the Saros is useful for organizing eclipses into families or series.
	umbra.nascom.nasa.gov /eclipse/20060329/text/chapter_1.html (7923 words)

	De eclipsibus
		n contrast to lunar eclipse, a penumbra is visible in solar eclipse.
		A solar eclipse does not appear at the same time at every point on the earth at which it is visible.
		The farther from the eclipse path, the less part of the Sun is obscured in the eclipse.
	www.worldastrology.net /eclipses.html (705 words)

	Eclipses
		The eclipse is named for the object that is being eclipsed, or obscured.
		In a lunar eclipse you observe the Moon.
		Penumbral lunar eclipses are very difficult to detect because the Moon dims only slightly while moving through that region.
	www.astro-tom.com /getting_started/eclipses.htm (659 words)

	Announcement: Lunar Eclipse
		The total eclipse begins at 9:19, when the Moon passes entirely into the umbra, and it lasts until 10:29, when part of the Moon first leaves the umbra and enters the penumbra.
		The eclipse is then partial until 11:36, at which time the last part of the Moon leaves the umbra.
		This will be the last total lunar eclipse visible from this part of the world until the year 2000, although there will be a near-total lunar eclipse this coming spring (March 23).
	www.ndsu.nodak.edu /instruct/kurtze/phys110/announce/eclipse.htm (169 words)

	Hermit Eclipse: Science: Mechanics of Solar Eclipses
		However, the type of eclipse which can be seen from a given location depends on whether the Moon passes directly, or only partly, between the Earth and Sun; but also on where on Earth you stand to observe it, and on a number of other factors.
		Such an eclipse would have a magnitude greater than 1.000, since the magnitude given for an eclipse represents the magnitude at maximum eclipse; but during the ends of the eclipse, the magnitude is less than 1.000.
		For example, in the hybrid eclipse of April 8 2005, the total part of the eclipse was visible for 42 seconds at its maximum point, and its track was no more than 27km wide.
	www.hermit.org /Eclipse/why_solar.html (1677 words)

	Moon Celebrates Spring with an Eclipse
		A lunar eclipse occurs when the moon is full and it passes through the shadow of the Earth.
		The penumbra is the region of partial shadow, if we were in the penumbra, we would see part of the Sun peeking around the edge of the Earth.
		This eclipse is a partial eclipse, but it moves so deeply into the shadow that only a thin crescent will remain unblemished.
	starryskies.com /articles/dln/3-97/eclipse.html (546 words)

	Solar Eclipse Penumbra Resource \| Solar Eclipse Penumbra Web-Site (Site not responding. Last check: 2007-10-31)
		A total solar eclipse when the moon passes in front of the sun and blocks it the penumbra is the area of partial eclipse.
		Eclipse Solar Gear's Solar Backpack is designed to trickle charge the batteries of many types and brands of electronics including cell phones, PDAs, hand held GPS units, and some MP3 players with a convenient solar charging solution.
		There were fears that because the eclipse was occurring at the height of summer, when the sun nears its zenith, over densely populated areas, the incidence of retinal injury would be greater than after similar events in the past.
	www.solareclipseanswers.info /solar-eclipse-penumbra.html (1102 words)

	APOD: 2003 November 7 - November's Lunar Eclipse (Site not responding. Last check: 2007-10-31)
		lunar eclipses go, this will be a brief one though, with the total phase lasting only about 25 minutes.
		The orientation and relative size of the Earth's shadow and the Moon's trajectory are illustrated in this thoughtful animation showing the full Moon moving up from the lower right, entering the penumbra or outer portion of the shadow region, and then passing well below the center of the darker inner shadow region or umbra.
		eclipse phase begins at 1:06 Universal Time, November 9 (8:06pm EST Nov. 8) when the Moon is completely within the umbra.
	antwrp.gsfc.nasa.gov /apod/ap031107.html (195 words)

	Moon will star in an eclipse sequel - Space.com - MSNBC.com (Site not responding. Last check: 2007-10-31)
		The eclipse occurs on a Saturday night, Nov. 8, in the Americas and early on the morning of Nov. 9 in Europe and elsewhere.
		Unlike an eclipse of the sun, which necessitates special viewing precautions in order to avoid eye damage, an eclipse of the moon is perfectly safe to watch.
		The penumbra, however, is all but invisible to the eye until the moon becomes deeply immersed in it.
	msnbc.msn.com /id/3158784 (1089 words)

	What is a solar eclipse? (Site not responding. Last check: 2007-10-31)
		It is caused by the shadow of the moon falling on the earth.
		In theory there could be a solar eclipse every new moon, but since the orbit of the moon is at a slight angle to the orbit of the earth around the sun, the shadow, or umbra, often falls above or below the earth.
		Outside the path of the umbra of a total eclipse, but within the penumbra, the eclipse is also partial.
	www.doublestandards.org /umbra3.html (228 words)

	science6space5
		This eclipse can be seen from anywhere in the world as long as the moon happens to be in the sky at the time.
		The Solar Eclipse is not as common as the Lunar Eclipse.
		Now, depending on where you are living, you may experience a total eclipse or you may have the partial eclipse.
	www.mysciencesite.com /science6space5.html (488 words)

	Hermit Eclipse: Science: Mechanics of Lunar Eclipses
		An observer standing on the Moon within the Earth's penumbra would see part of the Sun obscured; that is, they would see a partial solar eclipse.
		From Earth, when the Moon passes through the penumbra we see it dimming due to the reduced light, although in practice this can be hard to see with the eye.
		As you can see above, a total eclipse is always preceeded and followed by penumbral and partial stages; so the desriptions below of the penumbral and partial eclipse apply to these stages of a total eclipse, too.
	www.hermit.org /Eclipse/why_lunar.html (656 words)

	On the Nature of Eclipses
		The umbra is a central cone of darkness which tapers away from the Earth or Moon, whilst the penumbra is an outer cone of partial shadow which diverges instead of tapering.
		Penumbral eclipses are similarly influenced by the atmosphere, and vary from pale amber to an almost undetectable yellow.
		During a solar eclipse, in the middle of the lunar night, the Moon's shadow will appear as a circular grey disc on the Earth, darkening towards the fl umbra at the centre.
	www.inconstantmoon.com /cyc_ecl1.htm (797 words)

	Total Lunar Eclipse 28th October 2004
		As the time of eclipse drew near, it was apparent that the weather was not going to be favourable so we continued viewing the eclispe from a webcast coming from the Canary Islands.
		During the total phase of the eclipse, those under otherwise dark skies away from city lights should notice a distinct darkening of their surroundings as more stars emerge in the sky.
		At other eclipses it can glow a bright orange.The reason the Moon can be seen at all when totally eclipsed is that sunlight is scattered and refracted around the edge of the Earth by our atmosphere.
	www.eaas.co.uk /news/20041028_lunareclipse.html (1708 words)

	Penumbra Project
		Purdue Penumbra has been migrated to Eclipse 3.0 Please download the latest version (1.4.0) of the plug-in in order to test it.
		We are currently working on migrating Purdue Penumbra from Eclipse version 2.1.x to Eclipse 3.0 (which will be released at the end of June).
		Penumbra is available for public download as a precompiled plugin.
	www.cs.purdue.edu /s3/projects/eclipse (467 words)

	Chocolate Flower Farm - Primula polyanthus 'Penumbra' (Silver Laced Primrose) (Site not responding. Last check: 2007-10-31)
		The first silver laced primula to be commercially available, 'Penumbra' is a dramatic companion for the old fashioned gold laced primrose that has been available for centuries.
		Named for the curious slim edge of cool light that shows around the moon during an eclipse, 'Penumbra' grows to 10" and is heavenly in woodland gardens.
		Fragrant 'Penumbra' flowers from February to June and is hardy to zone 4.
	www.chocolateflowerfarm.com /inc/sdetail/1331 (165 words)

	Espenak - Key to Lunar Eclipse Maps
		The first number identifies the sequence position of the eclipse in the Saros, while the second is the total number of eclipses in the series.
		The point where the Moon is in the zenith at greatest eclipse is indicated by an asterisk symbol.
		The eclipse predictions were generated on a Macintosh Quadra using algorithms developed from the Explanatory Supplement [1974].
	sunearth.gsfc.nasa.gov /eclipse/OH/LEplotkey.html (684 words)

	Solar Eclipse: Why Eclipses Happen (Page 1 of 2)
		To see a total solar eclipse, you have to be in just the right spot on the earth.
		This means that very few people have seen a total eclipse because the shadow only covers a very small area on the earth.
		The penumbra is the area of partial eclipse.
	www.exploratorium.edu /eclipse/why.html (453 words)

	Your guide to the total lunar eclipse - Space.com - MSNBC.com
		Here is visible evidence that Earth is a sphere, as deduced by Aristotle from lunar eclipses he observed in the 4th century B.C. Almost as if a dimmer switch was slowly being turned down, the surrounding landscape and deep shadows of a brilliant moonlit night begin to fade away.
		Moon leaves penumbra - The eclipse "officially" ends, as it is completely free of the penumbral shadow.
		Across much of Alaska, the eclipse will already be under way when the moon comes up; over southwest Alaska, the moon will rise totally eclipsed, appearing like a weird, mottled, dim ball among the twilight stars.
	www.msnbc.msn.com /id/6307233 (1547 words)

	Solar Eclipses
		The common perception that eclipses are infrequent is because the observation of a total eclipse from a given point on the surface of the Earth is not a common occurrence.
		Annular Solar Eclipses occur when a region on the Earth's surface is in line with the umbra, but the distances are such that the tip of the umbra does not reach the Earth's surface.
		Because solar eclipses are the result of periodic motion of the Moon about the Earth, there are regularities in the timing of eclipses that give cycles of related eclipses.
	csep10.phys.utk.edu /astr161/lect/time/eclipses.html (1104 words)

	Dr. Dobb's \| Penumbra: Simplifying Eclipse \| September 1, 2004 (Site not responding. Last check: 2007-10-31)
		The Eclipse plug-in structure was designed with the idea that users would only want to add functionality but not remove any of it.
		Another goal of Penumbra was to provide a mechanism that allows for easy distribution of projects, containing skeleton files defining methods that must be implemented in the current project, as well as starter code and comments.
		For Penumbra to be able to set up the connection to the CVS repository and use it without the student explicitly knowing about it, we had to gather information from the students, such as user name and the location of the CVS repository.
	www.ddj.com /184405854 (3663 words)

	Eclipses (Site not responding. Last check: 2007-10-31)
		Lunar eclipses are technically visible from the entire night side of Earth, but during a penumbral eclipse, the dimming of the Moon's illumination is slight.
		The Moon enters penumbra at 9:05 P.M. PDT); the umbral phase begins at 10:03 P.M. PDT); totality begins at 11:14 P.M. PDT) and ends at 12:06 A.M. PDT); the umbral phase ends at 1:17 A.M. EDT (10:17 P.M.); the Moon leaves penumbra at 2:15 A.M. Annular eclipse of the Sun, May 30.
		The Moon enters penumbra at 5:15 P.M. PST); the umbral phase begins at 6:32 P.M. PST); totality begins at 8:07 P.M. PST) and ends at 8:31 P.M. EST (5:31 P.M.); the umbral phase ends at 10:04 P.M. PST); the Moon leaves penumbra at 11:22 P.M. Total eclipse of the Sun, November 23.
	www.almanac.com /details/eclipses.html (269 words)

	Moon Notes / Glossary
		- The partial solar eclipse is where the penumbra is on the Earth.
		- During a solar eclipse, the people in the penumbra see a partial solar eclipse, in which only part of the sun is blocked out by the new moon.
		- During a solar eclipse, the people in the umbra see a total solar eclipse, in which all of the sun is blocked out by the new moon.
	www.einfoweb.com /science/moon (972 words)

	Eclipse Corona
		In tandem, the novels of the Eclipse trilogy (of which "Eclipse Corona" is the final installment) provide the most dramatic example yet of a cyberpunk- fueled political sensibility in action.
		The global corporate/"private sector" secret police/Big Science power structure, against which the NR battle, is portrayed for us quite as vividly as militant naturalists represented the industrial "Octopus" of monopoly capitalists a century ago.
		"Eclipse Corona" shouldn't be perceived as merely a booted-up version of a socialist "strike" novel, however.
	www.streettech.com /bcp/BCPgraf/Media/eclipsecorona.htm (285 words)

	September 16: total lunar eclipse (Site not responding. Last check: 2007-10-31)
		The first event was the Moon's entry into the penumbra, the pale fringe of the Earth's shadow.
		But as it moved deeper and deeper into the dark shadow and the light of the still illuminated part of the Moon faded, a glowing dimly orange, red or brown glow at the immersed part could be be noticed.
		From those parts of the Moon, a total solar eclipse could be seen, with the sunlight deflected by the Earth's atmosphere creating a reddish-orange rim around the Earth.
	www.xs4all.nl /~carlkop/totme.html (434 words)

	Astronomy Without a Telescope
		In a total solar eclipse the bright disk of the Sun is completely covered up by the Moon and you can see the other parts of the Sun like the corona, chromosphere, and prominences.
		Unfortunately, only the tip of the Moon's umbra reaches the Earth (the tip hitting the Earth is at most 270 kilometers [168 miles] in diameter) and it zips along the Earth's surface at over 1600 kph (1000 mph) as the Moon moves around the rotating Earth.
		Sometimes the umbra does not reach the Earth at all (only the penumbra) even though the Moon is on the ecliptic and it is exactly in New Moon phase.
	www.astronomynotes.com /nakedeye/s14.htm (752 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		The orbital plane of the Moon is not in the ecliptic plane.
		Eclipses will occur only when the line of nodes points roughly toward the Sun.
		However, if you are in the outer shadow (the penumbra), you can see part of the Sun.
	zebu.uoregon.edu /~imamura/121/lecture-2/eclipse.html (253 words)

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