(documentationMagneticDeclinationFnEnglishLanguage "MagneticDeclinationFn takes in the latitude and longitude in AngleMeasure and returns the magnetic declination as an angle measure for that location. Magnetic declination is the angle between magnetic north and true north at a particular location on the Earth's surface, expressed in degrees and minutes east or west to indicate the direction of magnetic north from headingWRTTrueNorth. The angle can change over time due to polar wandering. By convention, declination is positive when magnetic north is east of the true north, and negative when it is to the west.[Wikipedia]")
(formatEnglishLanguageMagneticDeclinationFn "Location on Earth at Latitude %1 and Longitude %2 has a magnetic declination of PlaneAngleMeasure. (+) denotes easterly declination, (-) denotes westerly declination. zero value means at the agonic line.")