Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An angular mil, also mil, is a unit of angle. All versions of the angular mil are approximately the same size as a milliradian. The milliradian was first identified in the mid 19th Century. Degrees and minutes were the usual units of angular measurement but others were being proposed, with 'grads' under various names having considerable popularity in much of northern Europe, the grad was based on dividing a right angle into 100 units. However, Imperial Russia used a different approach, dividing a circle into equilateral triangles and hence 600 units to a circle.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.