Formulae. 1  Eclipsing binary: diameter = speed Ã time of eclipse. 2  Size from luminosity: star's radius/Sun's radius = (Sun's temperature/star's temperature)2 Sqrt[star's luminosity/Sun's luminosity].
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.
The jaws of the caliper indicate the formal value of minute of angle (MOA) at 100 yards, 1.0471996 inches, allowing for vagaries of operator interpolation and mechanical tolerances. The ruler shows 1 inch, the commonly accepted value of MOA at 100 yards. The MOA is a useful tool for shooters because it varies in direct proportion to distance. Our nominal inch at 100 yards is a half-inch at 50 yards, 2 inches at 200 yards, 3 inches at 300 yards, and so on.