backsight
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(′bak′sīt)
(engineering) A sight on a previously established survey point or line. Reading a leveling rod in its unchanged position after moving the leveling instrument to a different location.
(navigation) A marine sextant observation of a celestial body made by facing 180° from the azimuth of the body and using the visible horizon in the direction in which the observer is facing.
Oxford Dictionary of the US Military:
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backsight
n. the sight of a rifle or other weapon that is nearer the eye.
See the Introduction, Abbreviations and Pronunciation for further details.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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