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.
For example, if the water is 8 metres (26 ft) deep, and the anchor roller is 1 m (3 ft) above the water, the scope is the ratio between the amount of cable let out and 9 m (30 ft). For this reason it is important to have a reliable and accurate method of measuring the depth of water.