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Angular mil

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	Topics Angular mil Topic Home An angular mil, also mil, is a unitUnits of measurement The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early... of angleAngle An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle.... . Origin of the name All versions of the angular mil are approximately the same size as a milliradianRadian The radian is a unit of plane angle.... . Use The angular mil is commonly used by military organizations. Its relationship to the radian gives rise to the handy property that object of size s that subtends an angle ? angular mils is at a distance d = 1000s/?. Alternatively, if the distance is known, we can determine the size of an object by s = ?d/1000. The practical form of this that is easy to remember is: 1 mil at 1 km = about 1 metre (2p/6.4 ˜ 0.98 m to be more precise). Another example: 100 mils at 2 km = 200 metres. In the general case, where neither the distance nor the object size is known, the formulae may be of little use. In practice, sizes of observed objects are known with reasonable accuracy since they are often people, buildings and vehicles. Using the formulae, distances of the objects can be readily calculated without a calculator. In military terms, distances are of course essential for artilleryArtillery Historically, *artillery* refers to any engine used for the discharge of projectiles during war.... bombardments and estimations of journey times. Markings on Gunsights Many telescopic sightTelescopic sight Summary A telescopic sight, commonly referred to as a scope, is a device used to give an accurate point of aim for weapons suc... s used on rifles have reticleReticle An astronomical instrument used to measure star positions.... s that are marked in angular mils, and these are generally called mil dot scopes. The mil dots serve two purposes, range estimation and trajectory correction. By determining how many angular mils an object of known size subtends, the distance to that object can be estimated with a fair degree of accuracy. Once the distance is known, the drop of the bullet at that range (see external ballisticsExternal ballistics External ballistics is the part of ballistics that refers to the behavior of a bullet after it exits the barrel and before i... ), converted back into angular mils, can be used to adjust the aiming point. Generally mil dot scopes have both horizontal and vertical crosshairs marked; the horizontal and vertical marks are used for range estimation and the vertical marks for bullet drop compensation. Skilled shooters, however, can also use the horizontal dots to compensate for bullet drift due to wind. Mil dot scopes are most suited for long shots under uncertain conditions, such as those encountered by military sniperSniper [Image:01_SNIPERS_.jpg\|thumb\|right\|200px\| French Special Forces Sniping Team.... s and varmint huntersVarmint rifle Varmint rifle is an American English term for a relatively small-caliber firearm primarily used for hunting varmintssuch as ... . In both of those cases, the range to the target is not fixed and shots are taken at extreme ranges, so accurate compensation for bullet drop is required. The four definitions of the angular mil There are 2000pP The letter P is the sixteenth letter in the Latin alphabet.... milliradians in a circle. So a milliradian is just over of a circle. Each of the definitions of the angular mil are similar to that value but are easier to divide into many parts. }} of a circle in NATONATO Aznar also proposed a strategic co-operation with India and Colombia. ... countries. }}The “real” trigonometric unit of angular measurement of a circle in use by telescopic sightTelescopic sight A telescopic sight, commonly referred to as a scope, is a device used to give an accurate point of aim for weapons suc... manufacturers using (stadiametric) rangefinding in reticleReticle An astronomical instrument used to measure star positions.... s. }} of a circle in the former Soviet UnionSoviet Union The Union of Soviet Socialist Republics , more commonly known as the Soviet Union, was a Communist state that existed... and FinlandFinland The Republic of Finland , is one of the Nordic countries.... (Finland phasing out the standard in favour of the NATO standard). }} of a circle in SwedenSweden The Kingdom of Sweden is a Nordic country in Scandinavia.... . The Swedish term for this is streck, literally "line". Sweden has not been part of NATO nor the Warsaw PactWarsaw Pact he Warsaw Pact or Warsaw Treaty, officially named the Treaty of Friendship, Co-operation and Mutual Assistance ,... . Note however that Sweden is changing its map grid systems and angular measurement to those used by NATO, so the "streck" measurement is about to become obsolete. External links