The Firing Line Forums - View Single Post - I'm looking for a technical definition of MOA

Destructo6 · December 31, 2000, 02:53 AM

I'm not sure why arc length is being brought into this, seeing as the relation of arc length to radius is: arc length = radius * angle (in radians). Sure enough that the arc length of a sector with a 3600" radius and angle of one minute is .523599", but why would we be messing with an arc when we're measuring distance on a flat surface?

Aren't we talking of an angular deviation of the bullet impact to the point of aim? If so, then one minute at 100yds will give a circle with a ~1" radius.

December 31, 2000, 02:53 AM	#10
Destructo6 Senior Member Join Date: March 18, 1999 Location: Nogales, AZ USA Posts: 4,001	I'm not sure why arc length is being brought into this, seeing as the relation of arc length to radius is: arc length = radius * angle (in radians). Sure enough that the arc length of a sector with a 3600" radius and angle of one minute is .523599", but why would we be messing with an arc when we're measuring distance on a flat surface? Aren't we talking of an angular deviation of the bullet impact to the point of aim? If so, then one minute at 100yds will give a circle with a ~1" radius.