Africa is the only continent through which the equator, the Prime Meridian, the Tropic of Cancer and the Tropic of Capricorn pass. The Prime Meridian passes through West Africa. The equator runs through Sub-Saharan Africa, while the Tropics of Cancer and Capricorn run through north and south Africa, respectively.
All of the above are lines of latitude and longitude, which form a grid system for locating places on the earth. The equator circles the planet at dead center between the poles, running in an east-west direction through South America, Africa and Southeast Asia. It marks the zero degree spot for lines of latitude. The Tropics of Cancer and Capricorn run parallel to the equator at 23.5 degrees north and south. The Prime Meridian is the starting point for lines of longitude.