Longitude is either qualified as East or West, or given as a signed numeric value of degrees East.
The geo.position tag uses a signed numeric value. Thus, positive values for Longitude correspond to locations East of Greenwich, e.g. in Asia. Locations West of Greenwich, e.g. in the United States, correspond to negative values of Longitude. Latitude is either qualified as North or South, or given as a signed numeric value of degrees North. The geo.position tag uses a signed numeric value.