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.
If you're looking at a target 100 yards away, four clicks will move the bullet's point-of-impact one inch. The principle is the same for those scopes having 1/8 MOA per click -- it takes eight clicks to equal one MOA, and when your target is 100 yards away, those eight clicks will move the point-of-impact one inch.