Darwin Core term name: decimalLongitude. Definition in Darwin Core: The geographic longitude (in decimal degrees, using the spatial reference system given in geodeticDatum) of the geographic center of a Location. Positive values are east of the Greenwich Meridian, negative values are west of it. Legal values lie between -180 and 180, inclusive.

public double DecimalLongitude { get; set; }

Public Property DecimalLongitude As Double
	Get
	Set

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

member DecimalLongitude : float with get, set