Backsight is a noun which is defined as the rear sight of a gun or rifle. It also refers to measurements taken from a point of known elevation in reference to a shot point. These measurements are vital in calculating the height of the theodolite.
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what is the definition of backsight
Advice (also called exhortation) is a form of relating personal or institutional opinions, belief systems, values, recommendations or guidance about certain situations relayed in some context to another...