TeachMeFinance.com - explain Backsight
Backsight The term 'Backsight' as it applies to the area of the weather can be defined as ' In hydrologic terms, a rod reading taken on a point of known elevation, a benchmark or a turning point. Backsights are added to the known elevation to arrive at the height of the instrument. With a known height of the instrument, the telescope can be used to determine the elevation of other points in the vicinity'.
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