What is parallax error?

Answer

Parallax error is an apparent difference or displacement in the apparent location of an object viewed along two dissimilar lines of sight, and is calculated by the angle or semi-angle of inclination amid those two lines.
Q&A Related to "What is parallax error?"
1. Orient your line of sight directly above the measurement marking so that an imaginary vertical line connects your eye, the marking and the object. Parallax error is primarily caused
http://www.ehow.com/how_10000073_prevent-parallax-...
:parallax error occurs when the line of sight or measure is not at right angles ( perpendicular ) to the objects being measured. Any distance between the object and the measuring
http://wiki.answers.com/Q/What_is_parallax_error_i...
( ′par·ə′laks ′er·ər ) (optics) Error in reading an instrument employing a scale and pointer because the observer's eye and pointer are not
http://www.answers.com/topic/parallax-error
Parallax error introduced when not reading an instrument directly from its front,due to separation of indicator & scale being read
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