A series of lines crisscrosses the world's maps and globes. The 180 horizontal latitude lines, and 360 vertical lines that mark east and west longitude, are vital to navigators.

According to the definition by the National Geographic Society, the tropics are the regions that lie either in the latitude lines 23.5 degrees North of the Equator or 23.5 degrees South of the ...

These lines of latitude are important to understanding the Sun's position. The three main points of latitude on a map. Ray Petelin Throughout the year, the Sun will only be directly overhead ...