Latitude measures how far north or south you are from the equator, expressed in degrees. The equator sits at 0° latitude, the North Pole at 90° north, and the South Pole at 90° south. If you live in New York City, you're at about 41° north latitude, while Sydney, Australia sits at 34° south.

On maps and globes, latitude lines run horizontally around the Earth like the rings on a stack of plates. These imaginary circles help sailors, pilots, and explorers figure out exactly where they are. Before GPS, navigators could determine their latitude by measuring the angle of the sun or the North Star above the horizon, a technique that saved countless lives at sea.

Important latitude lines have special names: the Tropic of Cancer at 23.5° north and the Tropic of Capricorn at 23.5° south mark where the sun appears directly overhead at least once each year. The Arctic Circle at 66.5° north and Antarctic Circle at 66.5° south define where you can experience 24-hour daylight in summer or darkness in winter.

Latitude also means freedom to act or choose. A teacher might give students considerable latitude in choosing their research topics, meaning flexibility to pursue their own interests. When someone has latitude to make decisions, they have room to use their own judgment rather than following rigid rules.