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.
VALERIE C. COFFEY, contributing editor. An optical spectrum analyzer (OSA) is a wavelength-selective optical power meter that measures signal power versus wavelength (or frequency), tunable over a specified wavelength range somewhere between the ultraviolet and the infrared, depending on the application.