par-al-lax  \'par-æ,-laks\  n  [MF parallaxe, fr. Gk parallaxis, fr. parallas-
                            sein to change, fr. para- + allassein to change, fr. allos other]  (1580) :
                            the apparent displacement or the difference in apparent direction of
                            an object as seen from two different points not on a straight line with
                            the object; esp: the angular difference in direction of a celestial body
                            as measured from two points on the earth's orbit
 
 

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