Longitude waa erey juqraafi ah oo tilmaamaya masaafada xagal ee bar ku taal dhulka dushiisa, laguna cabiro darajooyinka bari ama galbeed ee Prime Meridian, kaas oo ah xariiq tixraac ah oo dhex mara Royal Observatory ee Greenwich, London, England. Longitude waxa lala isticmaalaa loolka si loo go'aamiyo meel sax ah oogada dhulka.
