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.
Therefore, at 100 yards, one MOA is equal to 1.0472 inches. The formula works for any range. If the range is 500 yards, one MOA equals 5.2360 inches. Many shooters equate one MOA to one inch at 100 yards, 2 inches at 200 yards, and so on. Often, they will call a gun that shoots one-inch groups at 100 yards a âone-MOA gun.â Since targets are usually on an inch grid, and sight adjustments in fractions of an inch, the difference between âtrueâ minutes of angle and âshooters'â minutes of angle is academic at close range.âsem