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.
MINIMUM SECTOR ALTITUDE (MSA) (ICAO) â The lowest altitude which may be used which will pro-vide a minimum clearance of 300m (1000ft) above allobjects located in an area contained within a sectorofa circle of 46km (25NM) radius centered on a radioaid to navigation.