ArcObjects Library Reference (Geometry)

IGeographicCoordinateSystem.PrimeMeridian Property

[Visual Basic .NET]
Public ReadOnly Property PrimeMeridian As IPrimeMeridian

[C#]
public IPrimeMeridian PrimeMeridian {get;}

[C++]
HRESULT get_PrimeMeridian(
  IPrimeMeridian** prime
);

[C++]
Parameters
prime [out, retval]
  prime is a parameter of type IPrimeMeridian

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

[C#]

    private void PrintPrimeMeridianFromGCS()
    {
        // use activator class with SpatialReferenceEnvironment singleton
        Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
        System.Object obj = Activator.CreateInstance(factoryType);
        ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;

        IGeographicCoordinateSystem geographicCoordinateSystem = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
        IPrimeMeridian primeMeridian = geographicCoordinateSystem.PrimeMeridian;

        System.Windows.Forms.MessageBox.Show(primeMeridian.Name);
    }