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Parallactic Angle

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parallactic angle [¦par·ə¦lak·tik ′aŋ·gəl]
(astronomy)

Parallactic Angle 

in astronomy, the angle at the celestial body in the parallactic triangle. For an observer within the sphere it is measured counterclockwise from the side connecting the body with the celestial pole.



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The illusion of depth that gives a three-dimensional appearance when looking at a stereo pair is caused by each eye looking at the same object, but at parallactic angles.
 
 
 
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