What is Minute of Angle - MOA?  MOA is a mathmatical concept
that most firearm scopes incorporate. Minute of Angle (MOA) is
critical to sighting in your scope. MOA mathematical concepts
were used to develop the AccuScope scope sighting reference
tool.  The only MOA information needed to use AccuScope is your
scope's MOA number. AccuScope determines the number of
adjustment dial increments or "clicks" to rotate your scope's
elevation or windage adjustment dial to accurately sight in your
scope at multiple shooting distances.  Each click of the scope
turret is usually 1/4 or 1/2 MOA change and on some scopes 1/8
MOA. Normally, shooters refer to these adjustments as a change
of a fraction of an inch at 100 yards rather than the true value
of MOA for which they are supposedly calibrated to.  Calculating
Angle of Arc  The angle of an arc is expressed in number of
degrees. There are 360 degrees of arc to a full circle. Each
degree consists of 60 minutes of arc. The distance covered by
the measure of arc is relative