# Dictionary:Stadia tables

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{{#category_index:S|stadia tables}}
Tables giving values of the quantities (sin2α)/2 and cos^{2}α and/or sin^{2}α 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*=*FX*cos^{2}α=*FX*–*FX*sin^{2}α, and *V*=*FX*(sin2α)/2.