Dictionary:Stadia tables

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Tables giving values of the quantities (sin2α)/2 and cos2α and/or sin2α as functions of α. Used in calculating horizontal (H) and vertical (V) distances from a transit station to a stadia rod. If α is the angle which the line of sight makes with the horizontal, F is the stadia interval factor (often 100), and X is the distance on the rod between the cross hairs, then H=FXcos2α=FXFXsin2α, and V=FX(sin2α)/2.