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.
Re: MRAD and MOA scope adjustments, please educate me. MRAD, I assume is the new mall ninja term for milliradian, or simply a scope with some form of mil-dot inspired reticle. For a long time, mil-dot scopes retained the standard, run-of-the-mill hunting rifle adjustments - -usually quarter MOA clicks (most of them still do).