A Radian is the angle made by taking the radius of a circle and wrapping it along the circle's edge. Therefore 1 Radian is equal to (180/π) degrees. A milliradian is 1/1000 of this value
- One finger width at an arms length is approximately 30 mils wide. A fist is approx. 150 mils and a spread out hand is approx. 300 mils.
The angular mil is used for artillary calculations. One mil translates to approximately one metre at a distance of one thousand metres. The angle is used for calculating either size or range. Where the range is known the angle will give the size, where the size is known then the angle will give the range.