Parallax

[par·al·lax]

Parallax is how an object's position seems to shift, the way a person appears to move when you alternate looking through a camera viewfinder and using just your eyes.

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The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view.

Noun
the apparent displacement of an object as seen from two different points that are not on a line with the object

n.
The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view.

n.
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

Par"al*lax , n. [Gr. alternation, the mutual inclination of two lines forming an angle, fr. to change a little, go aside, deviate; beside, beyond + to change: cf. F. parallaxe. Cf. Parallel.] 1. The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. 2. (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. Annual parallax, the greatest value of the heliocentric parallax, or the greatest annual apparent change of place of a body as seen from the earth and sun; as, the annual parallax of a fixed star. -- Binocular parallax, the apparent difference in position of an object as seen separately by one eye, and then by the other, the head remaining unmoved. -- Diurnal, ∨ Geocentric, parallax, the parallax of a body with reference to the earth's center. This is the kind of parallax that is generally understood when the term is used without qualification. -- Heliocentric parallax, the parallax of a body with reference to the sun, or the angle subtended at the body by lines drawn from it to the earth and sun; as, the heliocentric parallax of a planet. -- Horizontal parallax, the geocentric parallx of a heavenly body when in the horizon, or the angle subtended at the body by the earth's radius. -- Optical parallax, the apparent displacement in position undergone by an object when viewed by either eye singly. Brande & C. -- Parallax of the cross wires (of an optical instrument), their apparent displacement when the eye changes its position, caused by their not being exactly in the focus of the object glass. -- Stellar parallax, the annual parallax of a fixed star.

The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view.

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