Gun Deflection

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Sight Deflection or "Gun Deflection" (or even "Scale" in American parlance) is the angular difference between a gun's bearing and the line of sight to the target intended to place the shell on target after factors that cause lateral deviation of shell or target during time-of-flight have played their role. In riflery, this is often termed "Kentucky windage,", but in naval gunnery it takes on an even larger dimension.