The latitude of the Earth gives the distance north or south of the equator. It is measured in degrees. Latitude is represented by the Greek letter phi, <math>\phi\,\!</math>. It is usually used along with a measurement of longitude in order to pinpoint a location on Earth.
The equator is numbered 0 degrees. Everything north or south of the equator is designated either as north latitude or south latitude. The Antarctic Circle, Tropic of Capricorn, Tropic of Cancer, and Arctic Circle are all circles of latitude.