The poles are at 90 Â , the North Pole is at 90 Â N ( orth ) , the South Pole is at 90 Â S ( outh ) . Places with the same latitude are on a circle , around the Earth . The north pole is 90 Â N ; the south pole is 90 Â S. The 0 Â parallel of latitude is designated the equator , the fundamental plane of all geographic coordinate systems .