On earth , the Arctic Circle is at a latitude of 66 Ë 33 ' 38 '' N , and the Antarctic Circle is at a latitude of 66 Ë 33 ' 38 '' S. Areas between each polar circle and its pole ( north pole , or south pole ) will each year have at least one 24 hour period when the sun is continuously above the horizon and at least one 24 hour period when the sun is continuously below the horizion . Areas between each polar circle and its associated pole ( North Pole or South Pole ) , known geographically as the frigid zones , would theoretically experience at least one 24 hour period when the sun is continuously above the horizon and at least one 24 hour period when the sun is continuously below the horizon annually .