(=>
(and
(instance ?AREA GeographicArea)
(objectGeographicCoordinates ?AREA ?LAT ?LONG)
(equal
(MeasureFn ?DEG AngularDegree)
(MagneticDeclinationFn ?LAT ?LONG)))
(exists (?MN)
(and
(headingWRTMagneticNorth ?AREA
(MeasureFn ?MN AngularDegree))
(headingWRTTrueNorth ?AREA
(MeasureFn
(AdditionFn ?MN ?DEG) AngularDegree))))) |
Geography.kif 5220-5232 |
If X is an instance of geographic area, X is object geographic coordinates Y for Z, and equal W angular degree(s) and Location on Earth at Latitude Y and Longitude Z has a magnetic declination of PlaneAngleMeasure. (+) denotes easterly declination, (-) denotes westerly declination. zero value means at the agonic line., then there exists V such that V angular degree(s) is a headingWRT magnetic north of X and (V and W) angular degree(s) is a headingWRT true north of X |