1° of latitude is equal to

At the equator, the length of 1^o of latitude is equal to 110.6 km (68.7 mi.) and at the poles, the length of 1^o of latitude is equal to 111.7 km (69.4 mi.). For our purposes, we assume the length of 1° of latitude is 111 km. Lines of longitude, also called meridians, run north - south.