The most important lines of latitudes are:
- The equator, which represent O0
- The Tropic of Cancer, which represent 23½ 0 N
- The Tropic of Capricorn, which represent 23½ 0N
- The Arctic Circle, which represent 66½ 0 N.
- The Antarctic Circle, which represent 66½ 0 S
- The North and South poles, which represent 900N and 900 S