converting radians to and from degrees, minutes and seconds
converting decimal degrees to and from degrees, minutes and seconds,
converting decimal degrees to and from degrees and decimal minutes, and
performing addition and subtraction of angles.
Input values may be in the range -360° 0' 0" through 360° 0' 0" for degrees and the equivalent for radians (thus -2pi through 2pi). Addition and subtraction of angles is modulo 2pi. Has options for rounding degree values to minutes and for output of degree values in decimal degrees and decimal minutes.
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