backsight

  1. Noun.  The rear sight of a firearm.
  2. Noun.  (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the theodolite.
  3. Noun.  (surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position.
  4. Verb.  (surveying) To shoot a backsight. .

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This entry was last updated on RefTopia from its source on 3/20/2012.