What is MOA?
I know that MOA stands for minute of angle. What exactly does it mean? And is 1/8 better than 1/4 or is it the other way?

Using and Understanding Minute of Angle (MOA)
NOTE: You should understand that an English inch and a Minute of Angle (MOA) is not the same thing. (That disclaimer is to avoid me going all engineering on you. Should you want some additional info, see post # 10.) They are units of measurement that to avoid obfuscation, are close enough together that for the rest of this explanation I will simply round down to an inch. Exact Minute of Angle (MOA): 1 MOA = 1.0471996 inches @ 100 yards.Rounding MOA: 1 MOA @ 100 yards = 1 inchMinute of Angle as it applies to group size and drop: MOA is used to measure group sizes. A 1 inch group @ 100 yards is referred to as a 1 MOA group.At 100 yards it seems simple enough to understand. However, it can get confusing if you’re not used to the terminology when you move beyond 100 yards. For example: A 3 inch group shot at 300 yards is also a 1 MOA group.Another way to look at it is like this: ½ MOA @ 700 yards is 3.5 inchesCalculations: How many inches equal 4 MOA at 700 yards? * (MOA x yards) / 100 = inches (4 MOA x 700 yards) / 100 = 28 in *You can drop the last step and make the calculations easier by moving the decimal on the yards two places to the left. How many inches equal 4 MOA at 700 yards? (4 MOA x 7.00 yards) = 28 in How many MOA equal 21 inches at 700 yards? * (inches / yards)100 = MOA (21 inches / 700 yards) 100 = 3 MOA *You can drop the last step and make the calculations easier by moving the decimal on the yards two places to the left. How many MOA equal 21 inches at 700 yards? (21 inches / 7.00 yards) = 3 MOA 5 inches = 1 MOA how many yards away is the target? (Inches x MOA)100 = Yards (5 inches x 1 MOA) 100 = 500 yards Minutes of Angle and Rifle Scopes: Most hunting and target scopes adjust in Minutes of Angle (MOA). The most common adjustment is ¼ or .25 MOA per click. Although not as common, there are scopes that adjust in 1/8, 1/6/, 1/5, 1/3, ½, and 1 MOA. ¼ MOA at 100 yards literally means that each time the scope turret is clicked the bullet impact will move ¼ or .25 inches. To move the bullet impact 1 inch you would need 4 clicks (.25 x 4 = 1) Example: When sighting in a rifle the bullet needs to move up 5 inches to hit the center of target. 5 in / .25 in = 20 clicks or you could think of it like this: need to move 5 inches, 4 clicks per inch, 5in x 4 clicks per in = 20 clicks. Another application for understanding MOA and scope or sight adjustment is when shooting longer distances. Rifle is sighted in at 100 yards. Your ballistic program tells you that you need to come up 20 MOA to shoot at 600 yards. 20 MOA / .25 = 80 clicks Or 20 MOA x 4 clicks per MOA = 80 Clicks 
thumbs up cane. One more great post from you.

I have learned plenty much from your post, Canebrake. Thank you~
Zoey, 
WOW!!! :confused:
I'll have to read that a few times over. 
I always have to think harder for scope/sight adjustments for ranges under 100 yards/meters.
Ex: How many clicks of a 1/4 minute sight to move POI 5 inches @ 25 yards? ...thinking... :D 
Thanks Canebrake. I appreciate the lesson; now I believe that I could explain it to someone else.

Understood it all except this part.
35 inches = 1 MOA how many yards away is the target? (Inches x MOA)100 = Yards (5 inches x 1 MOA) 100 = 500 yards Is 35 a typo and should be 5? That would make more sense at 500 yds. Or 35"/1 MOA would be 3500 yards. No? Great post Cane and I always wondered about MOA, back in the day (30years ago) we always used " to talk about sighting in a rifle. Roger 
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Correction made, thanks  cane 
Nicely done, but I do have an issue with this:
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An inch (or foot, meter, etc) measures exactly the same amount of distance at all times, a stick measuring one inch is the same length regardless if it is right in front of you or one mile away. One MOA is an angular measurement that subtends to approximately one inch at 100 yds but as you point out it also subtends to TWO inches at 200 yds, three inches at 300 yds, etc. so it's "value" is always based on distance. http://i23.photobucket.com/albums/b378/FJ80FUN/moa.jpg 
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