This is an angular unit of measurement which is approximately 1.1" at 100 yards. This term is typically used in defining the click adjustments on a rifle scope.

In this context, angular change in aim that moves the point of impact of a rifle bullet one inch at 100 yards; only approximately a true mathematical minute of angle.

An angular measurement method used to describe accuracy capability. A minute of angle is one sixtieth of a degree, and subtends 1.047 inches at 100 yards, which for practical shooting purposes is considered to be one inch. A minute of angle group, therefore, equals one inch at 100 yards, two inches at 200 yards, etc.

An arc equal to 1/60th of a degree. It is used as a meansurement of accuracy. Conveniently enough, 1 MOA is equal to one inch at 100 yards. Half inch groups at 100 yards would equal .5 MOA accuracy.

Angular unit of measurement used to describe the Accuracy. One MOA equals 1/60th of a degree (21,600 minutes in a complete revolution) and subtends 1.0473 inches at 100 yards, or, as a rule of thumb, 1 inch at 100 yards. 1 Mil contains 3.44 MOA. MOA See Minute Of Angle.

A unit of angular measurement equal to 1/60th of a degree, which fortuitously subtends 1 inch (actually 1.047") at 100 yards, 2 inches at 200 yards, and so forth.

The arc subtended by an angle of one minute (1/60th of a degree) at any range, usually 100 yards. A minute of angle at 100 yards is 1.0471680" - This is called a TRUE minute of angle. Since 1.0471680" is so close to one inch that for all practical purposes it is considered an inch many people just use one inch as the value at 100 yeards - this makes calculations easier and is called a SHOOTER'S minute of angle.

The radial distance represented by 1/60 of a degree (there being 360 degrees in the circumference of a circle). The MOA is used in target shooting as a handy reference of accuracy and for sight adjustment. At a range of 100 yards 1 MOA represents a distance of 1.0472 inches (or approximately 1 inch). Sights are normally calibrated in fractions of a minute, a typical .22 target rifle with aperture sights will have 1/8 minute adjustments i.e. at 100 yards range, 1 click (see above) of the sight will move the point of impact 1/8 inch. General purpose telescopic sights normally have 1/4 minute adjustments.

A sight-adjustment measurement that equals one inch at a range of 100 yards.