southern hemispherethe hemisphere south of the equatorparallels of latitudeimaginary horizontal lines, running east to west, that measure the distance north and south of the Equatormeridians of longitudeimaginary vertical lines, running north to south, that measure the distance east and west of the Prime MeridianArctic Circle66.5 degrees north latitudeAntarctic Circle66.5 degrees south latitudeclimateOverall weather (temperature and precipitation) in an area over a long period of timehigh latitudes- areas north of the Arctic Circle and south of the Antarctic Circle; also know as polar zonemiddle latitudes- areas between the high and low latitudes; also known as temperate zonelow latitudes- areas between the Tropic of Cancer and the Tropic of Capricorn; also known as tropicsgridA system of lines that cross each other to form a series of squares or rectangles.