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Topic: Parallax

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		Parallax is the optical illusion that two stationary points change their position relative to each other, due to the motion of an observer.
		The parsec is the distance for which the annual parallax is 1 arcsecond and hence the maximum parallactic shift is 2 arcsecond.
		Measurements in parallax as the earth goes through its orbit was the first reliable way to determine the distances to the closest stars.
	wikiwhat.com /encyclopedia/p/pa/parallax.html (748 words)

	Parallax - Wikipedia, the free encyclopedia
		Parallax, or more accurately motion parallax (Greek: παραλλαγή (parallagé) = alteration) is the change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer.
		Distance measurement by parallax is a special case of the principle of triangulation, where one can solve for all the sides and angles in a network of triangles if, in addition to all the angles in the network, the length of only one side has been measured.
		Dynamic parallax has sometimes also been used to determine the distance to a supernova, when the optical wave front of the outburst was seen to propagate through the surrounding dust clouds at an apparent angular velocity, when we know its true propagation velocity to be the speed of light.
	en.wikipedia.org /wiki/Parallax (2765 words)

	Parallax mapping - Wikipedia, the free encyclopedia
		Parallax mapping is done by displacing the texture coordinates such that the texture occludes itself in accordance with a height map.
		Parallax mapping takes that pixel on the far left of the pencil when it was facing you directly and stretches it accordingly to simulate your angle in comparison to the pencil.
		Parallax mapping is also a way of faking displacement mapping where the actual geometric position of points surface is displaced along the surface normal according to the values stored into the texture: in Parallax mapping, like in normal and bump mapping, the silhouette of the object is unaffected.
	en.wikipedia.org /wiki/Parallax_mapping (273 words)

	parallax. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Formally, the parallax of a star is the angle at the star that is subtended by the mean distance between the earth and the sun.
		A unit of stellar measurement is the parsec; it is the distance at which a star would have a parallax of one second of arc and is equivalent to 206,265 times the distance from the earth to the sun, or about 3.3 light-years.
		Geocentric parallax is a technique similar to stellar parallax, which uses the diameter of the earth rather than the diameter of its orbit as a baseline.
	www.bartleby.com /65/pa/parallax.html (461 words)

	panoguide - What is Parallax?
		Parallax causes adjacent pictures for a panorama to differ in ways that prevents them from being stitched together perfectly.
		Parallax is essentially the movement of objects in 3D.
		The only way to eliminate parallax entirely is to use a panoramic head, which allows you to accurately position your camera so that when you take the pictures you are rotating the camera around the nodal point of the lens.
	www.panoguide.com /howto/panoramas/parallax.jsp (449 words)

	US Optics ~ Parallax Explained (Site not responding. Last check: 2007-10-21)
		Parallax can be defined appropriately to rifle scopes as; the apparent movement of objects within the field of view in relation to the reticle.
		In a telescopic sight, parallax occurs when the “primary image” of the object is formed either in front of, or behind the reticle.
		Parallax is also caused by optical deficiencies in the objective, either by design or manufacture.
	www.usoptics.com /sub_pages/parallax.php (659 words)

	Lunar Parallax Demonstration Project
		Parallax is best explained using a diagram (or two).
		This was a good parallax eclipse because during mid-eclipse the Moon would be sitting high above the UK meaning that it would be visible in the USA and across most of Europe.
		This is the Lunar Parallax Demonstration Probject or LPDP for short.
	www.digitalsky.org.uk /lunar_parallax.html (694 words)

	Parallax Scrolling Encyclopedia Articles @ Zosted.com (Site not responding. Last check: 2007-10-21)
		Parallax scrolling is a special scrolling technique in computer graphics.
		There are three main methods of parallax scrolling used in titles for video game console systems.
		Parallax scrolling was first used in the 1982 arcade game Moon Patrol.
	216.92.85.60 /encyclopedia/Parallax_scrolling (837 words)

	Parallax
		The parallax of the pencil depends on the distance the pencil is from you -- the closer the object, the larger the parallax.
		Thus, although it may have been hard to tell precisely, when the pencil was half the original distance from you, it had twice the parallax; when it was double the original distance from you, it had one-half the parallax.
		When the distance is large enough that the parallax angle is very small, the parallax angle is proportional to the inverse of the distance (1/d).
	www.astro.washington.edu /labs/clearinghouse/labs/Parallax/parallax.html (814 words)

	Properties of Stars
		The angular shift, called the parallax, is one angle of a triangle and the distance between the two vantage points is one side of the triangle.
		The size of the parallax angle p is proportional to the size of the baseline.
		If the parallax angle is too small to measure because the object is so far away, then the surveyors have to increase their distance from each other.
	www.astronomynotes.com /starprop/s2.htm (1485 words)

	Stellar Parallax (Site not responding. Last check: 2007-10-21)
		The measurement of parallax is used directly to find the distance of the body from the Earth (geocentric parallax) and from the Sun (heliocentric parallax).
		In the determination of a celestial distance by parallax measurement, the base line is taken as long as possible in order to obtain the greatest precision of measurement.
		The largest measured stellar parallax is 0.76", for the nearest star, Alpha Centauri; the smallest that can be directly measured is about 25 times smaller, but indirect methods permit calculation of the parallax, inversely proportional to the distance, for more and more distant objects but also with more and more uncertainty.
	abyss.uoregon.edu /~js/glossary/parallax.html (161 words)

	Steep Parallax Mapping
		Parallax mapping also has inherent swim, where the texture appears to slide over the surface due to a missing (1 / N dot V) factor, which Welsh intentionally removed the dot product to stablize the algorithm at glancing angles where the dot product is nearly zero.
		Nonetheless, parallax mapping with offset limiting is today considered the state of the art for real-time bump mapping.
		We implemented parallax mapping with offset limiting-- including a recent forum suggestion by flipcode.org poster 'ReedBeta' of scaling the offset by N dot V to reduce swim where the gradient is large-- in the Brown University CAVE.
	graphics.cs.brown.edu /games/SteepParallax (1144 words)

	Parallax
		The parallax can be used to measure the distance to the few stars which are close enough to the Sun to show a measurable parallax.
		The nearest star is proxima centauri, which exhibits a parallax of 0.762 arcsec, and therefore is 1.31 parsecs away.
		Some well-known examples of distance measurement by parallax are 61 Cygni at 1/3 of an arcsec, distance 3 parsecs, and Barnard's Star at 5.9 parsecs.
	hyperphysics.phy-astr.gsu.edu /hbase/astro/para.html (437 words)

	Parallax (Site not responding. Last check: 2007-10-21)
		Parallax measurements take advantage of the fact that, as the Earth orbits around the Sun, relatively near-by stars appear to move with respect to the fixed, very distant stars (see the diagram below).
		Parallax is simply the apparent change in the position of an object due to a change in the location of the observer.
		In order to measure the parallax of stars which are very far away, we must use the largest baseline possible.
	www.astro.umd.edu /education/astro/sprop/parallax.html (445 words)

	Parallax
		That means that the angle α; between AC and BC is small; that angle is known as the parallax of C, as viewed from AB.
		All observed parallaxes are less than 1", at the limit of the resolving power of even large ground-based telescopes.
		In measuring star distances, astronomers frequently use the parsec, the distance to a star whose yearly parallax is 1"--one second of arc.
	www-istp.gsfc.nasa.gov /stargaze/Sparalax.htm (934 words)

	Parallax - Introduction & Directions (Site not responding. Last check: 2007-10-21)
		In this lab you will become more familiar with parallax, and use it to measure the distance to a toy at the other end of your lab table, the distance to a building across campus, and finally the distance to the Moon.
		The parallax method (sometimes called geometric or trigonometric parallax, or triangulation) is the principle, direct method of obtaining distances to objects outside the solar system.
		So the parallax angle a is just the difference between the two angles b that you measure between the target and the very distant reference object.
	www.astro.lsa.umich.edu /Course/Labs/parallax/px_intro.html (2313 words)

	Super-Villains \| Parallax (Site not responding. Last check: 2007-10-21)
		Yet in 2071, Parallax helped Trey of Rann, the first Gold Man, reignite the dying sun and prevent Earth from facing its “final night.” However, Parallax scarified Trey’s life to save his own and in 2075 found an alternate timeline, where his world was not destroyed.
		Parallax also killed Justice Leaguer Plastic Man in the resulting battle.
		At the end of the conflict, Parallax was finally killed by Jack Kent/Superman, Doc Holiday, The Spectre and Timeshaper.
	www.angelfire.com /hero/ak_comics/Parallax.html (127 words)

	Cinematexas 11 - Parallax View (Site not responding. Last check: 2007-10-21)
		Parallax View, now in its 6th incarnation, lives more suitably in a realm of action verbs than adjectives and nouns.
		Parallax focuses on specific regions or conflicts whose causes and circumstances transgress national borders, i.e.
		Parallax View, a vital laboratory for the discussion and promotion of alternatives to mainstream media and its manufacture, will prove to be a critical and informative exploration of contemporary political issues – an essential retreat from “what most people are gonna think.”
	cinematexas.org /festival/sectionIndex.html?id=4 (763 words)

	Curious About Astronomy: Is there a proof that Earth moves?
		Parallax should not be confused with aberration: parallax arises from the change of Earth's position and depends on the distance to the star, while aberration is caused by Earth's great speed and does not depend on how far the star is.
		Parallax of a star was first measured by Bessel in 1838.
		This was a very important discovery because Aristotle himself mentioned the lack of observable stellar parallax as the proof that the Earth is not moving (he didn't have a telescope and didn't know that the stars are so distant).
	curious.astro.cornell.edu /question.php?number=190 (705 words)

	Parallax: Distance to Stars
		Detecting the annual parallax motion of the stars was proposed early on as a proof of heliocentrism (a Sun-centered Solar System).
		A star with a parallax shift of one arcsecond would be one parsec away (but no stars are this close).
		A star with a parallax of half an arcsecond would be two parsecs away, a third of an arcsecond means three parsecs, etc.
	www.noao.edu /outreach/nop/nophigh/steve9.html (851 words)

	Taylor & Francis Journals: Welcome
		Founded in 1995, parallax has established an international reputation for bringing together outstanding new work in cultural studies, critical theory and philosophy.
		Each issue of parallax provides a forum for a wide spectrum of perspectives on a topical question or concern.
		parallax will be of interest to those working in cultural studies, critical heory, cultural history, philosophy, gender studies, queer theory, post-colonial theory, English and comparative literature, aesthetics, art history and visual cultures.
	www.tandf.co.uk /journals/titles/13534645.asp (119 words)

	Parallax Press - About Parallax, Volunteering, Internships, and Jobs
		"Parallax" is derived from the Greek word meaning "to change." It describes the "apparent change in an object based on the actual change in the position of the subject." In other words, when you change the way you look at things, they appear differently.
		Parallax Press has a small staff that works together as a sangha, an intentional community.
		Friends of Parallax Press is a direct way you can help us sustain our commitment to reaching a wide audience and to preserve Thich Nhat Hanh's teaching for future generations.
	www.parallax.org /about_parallax.html (597 words)

	Parallax (Site not responding. Last check: 2007-10-21)
		Generally speaking, parallax is the apparent shift in the direction to an object as seen from two different locations.
		Stellar parallax occurs as the Earth orbits the Sun and our line of sight to a nearby star varies.
		In reality, stellar distances are so great that parallax shifts are less than an arc second, completely unobservable to the unaided eye.
	www.astro.virginia.edu /~jh8h/glossary/parallax.htm (146 words)

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