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what is MOA
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<blockquote data-quote="Eaglet" data-source="post: 389974" data-attributes="member: 3756"><p>A MOA is an angular measurement. A MOA stands for "Minute of Angle". A circle has 360 degrees and one degree has 60 minutes so 360 X 60 = 21600 Minutes.</p><p>Imagine a Circle that has a one inch radius, very small circle, still would have <strong>21600 </strong>minutes all the way around. So...</p><p>In our circle, R = 1"</p><p>Now, the perimeter of that circle, has a dimension, that would be like a string going around the circle and then you measure it... but will do it with numbers.</p><p> </p><p>Perimeter = 2 X PI X R</p><p>PI = 3.14159265</p><p>R = 1"</p><p> </p><p>Perimeter = 2 x 3.14159265 x 1" = 6.2831853" </p><p> </p><p>6.28319" would be the length of a string going around a circle of R = 1".</p><p> </p><p>Now let's take that distance and divide it by the number of minutes in the circle just to see what would be the distance that corresponds to 1 minute or one MOA.</p><p> </p><p>6.2831853 / 21600 = .000290888" <strong>That means that 1 MOA</strong> (that little angle)<strong> in 1" has a cord length of 0.000290888"</strong></p><p> </p><p>Now, there are 3600 inches in 100 yards ********</p><p> </p><p>3600" x 0.000290888" = 1.047... inches.</p><p> </p><p><strong>What is it? The angular dimension of 1 MOA produces a distance of 1.047 inches at 100 yards.</strong></p><p> </p><p>Many folks would say it's close enough to 1 inch and so they say that one MOA is 1 inch at 100 yards. That in many applications is alright but you need to be careful because in other situations it'll bite back at you.</p><p> </p><p><strong>So 1 MOA angle subtends 10.47" at 1000 yards.</strong></p><p> </p><p><strong>Goes without saying that:</strong></p><p> </p><p>1 MOA = 1.047" AT 100 YARDS</p><p>1 MOA = 2.094" AT 200 YARDS</p><p>1 MOA = 3.141" AT 300 YARDS</p><p>1 MOA = 4.188" AT 400 YARDS ETC.</p></blockquote><p></p>
[QUOTE="Eaglet, post: 389974, member: 3756"] A MOA is an angular measurement. A MOA stands for "Minute of Angle". A circle has 360 degrees and one degree has 60 minutes so 360 X 60 = 21600 Minutes. Imagine a Circle that has a one inch radius, very small circle, still would have [B]21600 [/B]minutes all the way around. So... In our circle, R = 1" Now, the perimeter of that circle, has a dimension, that would be like a string going around the circle and then you measure it... but will do it with numbers. Perimeter = 2 X PI X R PI = 3.14159265 R = 1" Perimeter = 2 x 3.14159265 x 1" = 6.2831853" 6.28319" would be the length of a string going around a circle of R = 1". Now let's take that distance and divide it by the number of minutes in the circle just to see what would be the distance that corresponds to 1 minute or one MOA. 6.2831853 / 21600 = .000290888" [B]That means that 1 MOA[/B] (that little angle)[B] in 1" has a cord length of 0.000290888"[/B] Now, there are 3600 inches in 100 yards ******** 3600" x 0.000290888" = 1.047... inches. [B]What is it? The angular dimension of 1 MOA produces a distance of 1.047 inches at 100 yards.[/B] Many folks would say it's close enough to 1 inch and so they say that one MOA is 1 inch at 100 yards. That in many applications is alright but you need to be careful because in other situations it'll bite back at you. [B]So 1 MOA angle subtends 10.47" at 1000 yards.[/B] [B]Goes without saying that:[/B] 1 MOA = 1.047" AT 100 YARDS 1 MOA = 2.094" AT 200 YARDS 1 MOA = 3.141" AT 300 YARDS 1 MOA = 4.188" AT 400 YARDS ETC. [/QUOTE]
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