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3/20/2017 5:03:23 PM
Posted: 1/10/2002 6:46:34 AM EDT
I have seen so many people ask about this that I whipped up a diagram to illustrate it. Here it is:

Link Posted: 1/10/2002 7:20:16 AM EDT
Actually when dealing with firearms a MOA is considered to be by defination a linear measurement equaling 1" on a target 100 meters away from the muzzle. It approximates the geometric. The truly quasi-scientific folks will spend hours explaining this and confuse themselves and others in the process. A true waste of time.

1MOA is 1" at 100 yards; 2" at 200 yards; etc.

Trying to make it scientific, or show how it's derived just gives folks a headache.

-- Chuck
Link Posted: 1/10/2002 7:39:23 AM EDT
Chuck, I'm afraid you're pretty much completely wrong on this one. And it's spelled "definition".

The "one inch at 100 meters" notion describes, approximately, the sides of a right triangle with an interior angle that subtends 1 MOA.
Link Posted: 1/10/2002 7:48:17 AM EDT
about 1.1" at 100 yards (Art Pejsa). usually rounded to an even 1".

Link Posted: 1/10/2002 4:02:15 PM EDT
For the math;

1) 1 minute of angle=1/60th of a degree

2) 100 yards=3,600 inches

3) sin of 1 degree/60=.0002909

3,600(.0002909)=1.047" or 1" rounded

Class dismissed.

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