EntityQ841280· pop 31· linked from 331 articlesquadrantSign in to savenavigation instrumentConnectionsastrolabeEntitymural instrumentEntityDante AlighieriEntityNicolaus CopernicusEntityInternational Standard Book NumberEntityMuḥammad ibn Musa al-KhwarizmiEntitysolar eclipseEntityangleEntitySamarkandEntityPtolemyEntitylatitudeEntityThe Divine ComedyEntitylongitudeEntityTycho BraheEntityastronomical objectEntityRigvedaEntitydigital object identifierEntityartilleryEntityeclipticEntitynavigationEntityCategoriesAngle measuring instrumentsArab inventionsAstronomical instrumentsAstronomy in the medieval Islamic worldGreek inventionsIranian inventionsMarine navigationNavigational equipmentObsolete scientific instrumentsSurveyingTechnology in the medieval Islamic world