public double Angle { get; set; }

Public Property Angle As Double
	Get
	Set

public:
property double Angle {
	double get ();
	void set (double value);
}

This is the angle difference between project north and true north measured in radians. It can have a value from -PI to PI. If the parameter value is outside that range, it will be shifted by 2*PI until it falls into range.