View Full Version : MOA vs. milliradian
I was thinking about getting one of the Hi-Lux scopes for my AR since the company web page says that it is marked in both MOA and MIL. While looking at there web page I found the following chart:
What bothers me is that their numbers seem off. For example they say that 1 MOA= .2778 MIL, but I get that 1MOA = .290888 MIL which rounds to .2909 MIL. I checked a lot of the other numbers on their chart and they seem off as well. What am I doing wrong?
Check out this site may help! http://www.mildottargets.com
One mil equals a width of .982 Meters at a distance of 1000 Meters.
Not exactly accurate But some do assume that one Mil equals one Meter at 1000 Meters which introduces an error of .018 meters
This could account for the errors in calculations
Definitions of the angular milThere are 2000π milliradians (≈ 6283.185 mrad) in a circle. So a milliradian is just under 1⁄6283 of a circle, or ≈ 3.438 minutes of arc. Each of the definitions of the angular mil are similar to that value but are easier to divide into many parts.
1⁄6400 of a circle in NATO countries.
1⁄6283 The “real” trigonometric unit of angular measurement of a circle in use by telescopic sight manufacturers using (stadiametric) rangefinding in reticles.
1⁄6000 of a circle in the former Soviet Union and Finland (Finland phasing out the standard in favour of the NATO standard).
1⁄6300 of a circle in Sweden. The Swedish term for this is streck, literally "line". Sweden (and Finland) have not been part of NATO nor the Warsaw Pact. Note however that Sweden has changed its map grid systems and angular measurement to those used by NATO, so the "streck" measurement is obsolete.
This may also help
There are 2 x Pi radians in a circle. Pi is a repeating decimal that goes on into infinity. For most practical engineering purposes Pi is resolved to 3.1416. Then 2 x Pi = 6.282 radians. Since the radian is a large function to work with this is usually multiplied by 1000 to arrive at milli radian or “mill”; therefore, there are 6282 milli radians to a circle. For practical purposes this is sometimes rounded of to 6280.
I worked at a naval ordnance facility (USNMTF) located on an army base (White Sands Missile, New Mexico). While there one had to be very careful when referring to “mills” , because the army decided that 6280 was too hard to work with and chose to use 6400 mills to the circle for ease of calculation while the navy stayed with 6280. (A relatively insignificant difference when using at rifle ranges, but very significant when firing missiles in excess of 100 miles.) Therefore the ‘army’ mill is smaller than the navy mill. When using a “gunner’s quadrant” one had to be careful to determine whether it was a navy gunner’s quadrant or an army artillery gunners quadrant. Prior to WWII the army used two "mil" systems. The infantry mil was based upon 6280 and the artillary mil was based upnm 6400 mils per circle. Since WWII the army jhas adopted 6400 as the standard.
That was in the 1950’s and 60’s so the Navy may have adopted the NATO 6400 mill standard by now.
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