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