parallax

Definitions

  • WordNet 3.6
    • n parallax the apparent displacement of an object as seen from two different points that are not on a line with the object
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Webster's Revised Unabridged Dictionary
    • Parallax (Astron) The annual parallax. See annual parallax, below.
    • Parallax (Astron) The apparent difference in position of a body (as the sun, or a star) as seen from some point on the earth's surface, and as seen from some other conventional point, as the earth's center or the sun.
    • Parallax The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view.
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Century Dictionary and Cyclopedia
    • n parallax An apparent displacement of an object observed, due to real displacement of the observer, so that the direction of the former with reference to the latter is changed. In the cut, the angle BCD, being the semidiameter of AB as seen from C, is the parallax of C as seen from B. In astronomy, parallax is due either to our daily motion round the center of the earth, or to our yearly motion round the sun. Parallax is observed, also, when the head is moved before two images or other objects in the region of distinct vision and at unequal distances. There is also an effect of parallax when we alternately shut one eye and open the other.
    • n parallax In optics, an apparent shifting of the spider-lines in a telescope-reticle as the eye is moved before the eyepiece: it is due to the non-coincidence of the threads with the focal plane of the object-glass.
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Chambers's Twentieth Century Dictionary
    • n Parallax par′a-laks an apparent change in the position of an object caused by change of position in the observer:
    • n Parallax par′a-laks (astron.) the difference between the apparent and real place of a star or other celestial object
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Etymology

Webster's Revised Unabridged Dictionary
Gr. alternation, the mutual inclination of two lines forming an angle, fr. to change a little, go aside, deviate; para` beside, beyond + to change: cf. F. parallaxe,. Cf. Parallel
Chambers's Twentieth Century Dictionary
Gr. parallaxispara, beside, allassein, to change—allos, another.

Usage

In literature:

It is not necessary for two observers to actually station themselves at two distant parts of the earth in order to determine a parallax.
"Recreations in Astronomy" by Henry Warren
ADAMS has up to now published 1646 parallax stars.
"Lectures on Stellar Statistics" by Carl Vilhelm Ludvig Charlier
But the parallax was considerable.
"The Book of the Damned" by Charles Fort
He thinks of nothing but parallaxes.
"Lalage's Lovers" by George A. Birmingham
Another experiment conducted by Parallax the same morning was creditable to his ingenuity.
"Myths and Marvels of Astronomy" by Richard A. Proctor
In such a case, no matter how near the stars were to the earth, no parallax could be detected.
"The Story of the Heavens" by Robert Stawell Ball
When the altitude is highest there is no parallax.
"Lectures in Navigation" by Ernest Gallaudet Draper
In some, however, the parallax, though very minute, is yet approximately measurable.
"The Beauties of Nature" by Sir John Lubbock
Parallax errors are avoided.
"Cyclopedia of Telephony and Telegraphy, Vol. 2" by Kempster Miller
Much success has been achieved in ascertaining the parallax of fixed stars.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various
Thus a reduction for parallax is required.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7" by Various
From the day that K. I. returned, my life has been like the parallax of a fever!
"The Dodd Family Abroad, Vol. I.(of II)" by Charles James Lever
Parallax aids in the perception of depth or distance.
"Visual Illusions" by Matthew Luckiesh
Observations of stellar parallax, however, show that this was a mistake.
"Astronomy with an Opera-glass" by Garrett Putman Serviss
For semi-diameter and also for refraction and parallax, -9'.
"My Attainment of the Pole" by Frederick A. Cook
That angle is called the sun's parallax.
"Scientific American Supplement, No. 648, June 2, 1888." by Various
In other words, he sought to find the star's parallax if it turned out to be a measurable quantity.
"Astronomy" by David Todd
He computed the moon's parallax to be 57', which is about its correct value.
"Astronomical Curiosities" by J. Ellard Gore
It is plain, from the figure, that near objects are much more affected by parallax than distant ones.
"Letters on Astronomy" by Denison Olmsted
We shall next hear of Mr. "BOBBY" SPENCER coming out with a treatise on the Solar Parallax.
"Punch, or the London Charivari" by Various
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In news:

Not to toot his own horn, but PRO AV's Parallax View columnist has a good idea of the major tech trends at this year's InfoComm show.
Local artist shows work at Manhattan Parallax AF.
Kristina Giunta-Faulkner, a Warren native, participated in Parallax AF, an art show in Manhattan's SoHo neighborhood during August.
Between the Buried and Me Recording ' Parallax II'.
The Parallax of American Religion.
REVIEWS Atlas Sound, ' Parallax .
Atlas Sound, " Parallax ".
Today, Michael Stenovac writes about Atlas Sound's Parallax .
So why not party like Vincent van Gogh at Parallax .
So why not party like Vincent van Gogh at Parallax.
Unique dual parallax air flow delivers a broad, warm-air pattern for a c...
Yet, questions still arise, partly because users are seeing other distortions that sometimes make adjusting for parallax confusing.
Recognizing these distortions as not belonging to parallax might make the exercise less frustrating.
Parallax View columnist and 2008 InfoComm Educator of the Year Pete Putman has a new lesson for you.
Last week, Deerhunter frontman Bradford Cox shared Parallax, the Atlanta psych-smith's third full-length as Atlas Sound.
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In science:

Using Hipparcos parallaxes Jaschek & G´omez 1998 have calculated MV for some MK standards.
A revised calibration of the Mv-W(OI 7774) relationship using Hipparcos data: Its application to Cepheids and evolved stars
Hipparcos parallaxes alone can be used to derive distances if the value of the parallax is larger than 5 times the error of the parallax value.
A revised calibration of the Mv-W(OI 7774) relationship using Hipparcos data: Its application to Cepheids and evolved stars
As in paper I we adopted MV = −1.0 from parallax value.
A revised calibration of the Mv-W(OI 7774) relationship using Hipparcos data: Its application to Cepheids and evolved stars
The ob ject may move because it has sufficiently large proper motion or trigonometric parallax.
A simple method of correcting magnitudes for the errors introduced by atmospheric refraction
Distance estimates are determined using a suite of new photometric color-MK s relations defined using a robust set of nearby stars with accurate V RI J HKs photometry and trigonometric parallaxes.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Of those without accurate trigonometric parallax measurements, there are five stars in the first sample and three in the second that are likely to be within 10 pc.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
We also provide a detailed check of the technique by applying it to the sample of very red dwarfs with parallaxes.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Trigonometric parallaxes have been collected from the two fundamental parallax references, the Yale Parallax Catalog (van Altena et al. 1995) and Hipparcos (ESA 1997).
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Of course, trigonometric parallaxes for additional ob jects (including many of those investigated here) and photometry would allow the improvement of the photometric relation matrix, in particular for the stars with types later than M7.0V.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Additional data on the reddest dwarfs (trigonometric parallaxes in particular) should determine which is the true cause.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Of the 22 other red dwarfs discussed here that have no accurate trigonometric parallaxes, we find that 10 are likely to be closer than 10 pc.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Trigonometric parallaxes, VRIJHKs photometry, and spectral types for SCR stars, recently discovered nearby red dwarfs, and stars with µ ≥ 1.0′′ /yr recovered in the SCR search.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Distance estimates from new photometric parallax relations.
The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
Flashing satellites could be resolved by their parallax.
"Pi of the Sky" - all-sky, real-time search for fast optical transients
Distances are known from parallax measurements to an uncertainty of 5% for all cases, and to <2% in the vast ma jority.
New Low Accretion-Rate Magnetic Binary Systems and their Significance for the Evolution of Cataclysmic Variables
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