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Approximating 1MOA as 1" results in an approximation error of about 5%. Not a big error. For reference, here are some other approximations that are about the same in magnitude:
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And the Kewl Guys talk in mils. A milliradian is conveniently the angle that subtends 1/1000 of the distance. Two pi radians in a circle, 6283.285 mils to the geometer. 6280 to the old infantry, 6400 to the artillery and now NATO. 6000 Rusky, 6300 Swedish.