Returns the World Longitude at reference point.

Integer list of values for degrees, minutes, seconds, and, optionally, millionths of seconds with respect to the world geodetic system WGS84.

Longitudes are measured relative to the geodetic zero meridian, nominally the same as the Greenwich prime meridian: longitudes west of the zero meridian have negative values - from 0 till -180, longitudes east of the zero meridian have positive values - from 0 till -180.