Longitude is a geographic coordinate that specifies the east–west position of a point on the Earth's surface, or the surface of a celestial body.
Longitude may also refer to: Celestial longitude, used to record positions of planets Longitude rewards, a British inducement prize for a solution to the longitude problem Longitude (book), by Dava Sobel about John Harrison Longitude (TV series), a 2000 TV drama produced from the book Longitude Prize, an inducement prize contest inspired from the longitude rewards Cessna Citation Longitude, a business jet Longitude Festival, an annual music festival in Dublin, Ireland Longitude LLC, a private business in parimutuel betting technology