Geographic location refers to a position on the Earth. Your absolute geographic location is defined by two coordinates, longitude and latitude. These two coordinates can be used to give specific locations independent of an outside reference point.Longitude denotes the east/west position of a geographic location. Longitude lines run north and south across the Earth, between the two poles. The prime meridian is the zero line for longitude. It runs between the North and South poles, through Greenwich, England. The prime meridian splits the Earth into the Eastern and Western hemispheres; the International Date Line divides the Earth opposite the prime meridian. The International Date Line is not straight due to social reasons, but all other longitude lines are parallel to the prime meridian. Latitude denotes the north/south position of a geographic location. Latitude lines run across the Earth, perpendicular to longitude. The equator divides the Earth into its Northern and Southern hemispheres. All other latitude lines are parallel to the equator. Lines that are below the equator are southern latitudes, whereas lines that are above the equator are northern latitudes.