摘要：

The invention relates to a targeting device including a casing which houses a wheel. The wheel is weighted and free to rotate relative to the casing. The wheel's absolute orientation remains stable, while the casing rotates with the weapon as it is aimed upward or downward. The casing has a window through which the wheel is visible. For any angle at which the weapon is positioned, a marker inscribed on the wheel aligns with a cosine or distance indicia indicating the cosine of the angle at which the weapon is positioned or the compensated distance to target.

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