longitude values
Latitude and longitude are both measured in degrees, minutes and seconds. There are 60 minutes in each degree and 60 seconds in each minute. Values for longitude range from 0 (for the Prime Meridian) to 180 degrees. They are denoted by the letters E or W to represent direction. Alternatively, positive values may be used east of the Prime Meridian and negative in the west. They range from 0 (for the Equator) to 90 (for the north and south poles).