Angle from True North.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0)
Syntax
Remarks
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.