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.
1 MOA = 1/60th of 1 Degree. Just like there are 60 Minutes in an Hour, there are 60 Minutes in a Degree. The Minute of Angle unit is useful to shooters because the math works out (after a negligible rounding down) that our target shot group sizes, when measured in inches, can be easily converted into MOA.