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minute of angle

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29 December 2002, 18:40
jim81147
minute of angle
Does 1 MOA equal 1 inch at 100 yards? I see this term referred to often bu have wondered how it translated into inches.Thanks.
29 December 2002, 19:34
Alstro
http://www.snipercentral.com/faq.htm

A circle has 360 degrees and each degree is made up of 60 minutes. By drawing two lines from the barrel, to the two outside shots, and measuring the angle between the lines, you get the Minutes of Angel.

[ 12-29-2002, 10:42: Message edited by: Alstro ]
29 December 2002, 19:37
<dshoots>
Yes, 1 MOA = 1 minute of angle, or 1/60 of a degree. At 100 yards, this angle defines an arc of approximately 1 inch, or 1.0466664 inches to be exact. Increasing the distance increases the length of arc this same angle describes so that at 200 yds. 1 MOA represents 2 inches, 3 inches at 300 yds. etc. dshoots
05 January 2003, 10:28
XWind
quote:
Originally posted by jim81147:
Does 1 MOA equal 1 inch at 100 yards? I see this term referred to often but have wondered how it translated into inches.Thanks.
Ready for 'too much information' [Big Grin]

I found the 'easiest way to calculate this is with the following formula:

inches X (tangent of 1) / 60

This is based on the basic trigonometric function:
T=O/A
Where T = Tangent of Angle
" A = Adjacent side of triangle
" O = Opposite side of triangle
O is what we are solving for so the equation becomes: O = T x A / 60

So for 100 yds you get:
3600" x (.01745506492822) / 60 = 1.04730389569306"

There's more than one way to do this but you get the idea...right [Eek!]

Here it is out to 1000 yds in 100yd increments
1 MOA=

100 yds = 1.04730389569306"
200 yds = 2.09460779138611"
300 yds = 3.14191168707917"
400 yds = 4.18921558277222"
500 yds = 5.23651947846527"
600 yds = 6.28382337415833"
700 yds = 7.33112726985139"
800 yds = 8.37843116554444"
900 yds = 9.42573506123750"
1000 yds= 10.4730389569305"

Accuracy is +/- .000000000001" or better

It is linear so you can just take the 100 yd number and multiply it by whatever yardage you want/100. So for 375 yds take the 100 yd figure and multiply by 3.75

Hey you asked... [Cool]

XWind

[ 01-05-2003, 01:37: Message edited by: XWind ]
05 January 2003, 12:11
Harley
Jim,

I recently read some books by James Owens that have interesting and insightful discussions regarding MOA. While his primary focus is the high-power shooting his insight applies to any caliber weapon. His books are available from Sinclair international.