Thread: MOA definition
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Old January 15, 1999, 02:38 PM   #6
Michael Carlin
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Join Date: October 13, 1998
Location: Fredericksburg, VA USA
Posts: 193
Pat has the definition and GLV (hi George) has the measurement for 100 yards.

As Pat indicates a Minute is 1/60th of a degree and we all Know that a circle has 360 of those.

SO:

360 degrees X 60 minutes per degree equals 21,600 minutes in a circle.

The circumference of a circle equals Pi X Diameter or 3.14 X Diameter

Diameter(equals 2X [the radius for a 100 yard MOA] (100 yards X 36 inches)= 7200 inches)

So.. 3.14 X 7200 = 22608 inches around a circle of 200 yards in diameter.

The circumference of 22608/21600 minutes in a circle = 1.047" subtended by an angle of One minute at a radius of 100 yards.

Hence:
One Minute of Angle = 1.047" at 100 yards
One Minute of angle = 5.233" at 500 yards

One Minute of Angle = 10.47" at 1000 yards


No mystery here, just simple geometry.

Hope this helps!


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