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.
USAA is a three-letter acronym that can stand for a wide variety of terms. 1  USAA (a sail boat association), US Albacore Association headquartered in San Antonio, TX. 2  USAA (an reciprocal inter-insurance exchange), United Services Automobile Exchange headquartered in San Antonio, TX.