When you stand to one side of an object and it looks off-center and small and then you move to the other side of the object and it looks larger and centered, this is an example of parallax.
- the apparent change in the position of an object resulting from the change in the direction or position from which it is viewed
- the amount of angular degree of such change: the parallax of an object may be used in determining its distance from the observer because smaller angles indicate greater distance
- Astron. the apparent difference in the position of a celestial object with reference to a fixed background when viewed from two distant locations having a triangulated base line equal to the radius of the earth (diurnal parallax or geocentric parallax) or equal to the radius of the earth's orbit (annual parallax or heliocentric parallax)
- the difference between the actual view covered by a camera lens and the apparent view seen through the viewfinder: this may be significant when the object is close to the camera
Origin of parallaxFrench parallaxe ; from Classical Greek parallaxis ; from parallassein, to vary, decline, wander ; from para-, para- + allassein, to change ; from allos, other: see else
Origin of parallaxFrench parallaxe, from Greek parallaxis, from parallassein, to change : para-, among; see para–1 + allassein, to exchange (from allos, other; see al-1 in Indo-European roots).
The apparent position of a star among more distant stars changes when viewed from opposite sides of the earth's orbit.
Ancient Greek Ï€Î±ÏÎ¬Î»Î»Î±Î¾Î¹Ï‚ (parallaksis, “alteration").