9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook parallax correction [′par·ə‚laks kə‚rek·shən] (navigation) In celestial navigation, that sextant altitude correction made necessary because of the difference between the apparent direction from a ...
Parallax in gun sights may cause a shooter difficulty in achieving a good zero. This in effect causes an enormous amount of wasted training time and excessive expenditure of ammunition. The lack of a good zero also reduces the soldier's confidence in their weapon and their ability to use it...