The line of latitude with this number of degrees lies halfway between the Equator & the North Pole
... that 20' latitude on this map is actually 40 20', because 20' lies in 
between... [DOC] [TLE] The Equator, Tropic of Cancer and Tropic of Capricorn - Geography [PAR] The equator is the line of latitude that is the longest and lies along the 
circumference of the earth, halfway between the North Pole and the South Pole.