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.
Each of these minutes is in and of itself a small angle, but you can use these small angles to adjust you gun sights because this distance covered by the MOA is relative to the circumference of your target. To calculate the MOA: Determine the circumference using the formula circumference = (radius x 2) x pi.