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About: Habash al-Hasib al-Marwazi     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPersianMathematicians, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingpersonyago:WikicatAstronomersyago:WikicatAstronomersOfMedievalIslamyago:WikicatMathematiciansOfMedievalIslamyago:WikicatMedievalPersianMathematiciansyago:WikicatMuslimAstrologersyago:WikicatScientistsWhoWorkedOnQiblaDeterminationyago:Astrologer109817816yago:Astronomer109818343yago:CausalAgent100007347yago:Forecaster110102506yago:Intellectual109621545yago:LivingThing100004258yago:Mathematician110301261yago:Object100002684yago:Organism100004475yago:Person100007846yago:PhysicalEntity100001930yago:Physicist110428004yago:WikicatIranianAstronomersyago:WikicatIranianScientistsyago:YagoLegalActoryago:YagoLegalActorGeoyago:Scientist110560637yago:Visionary110756433yago:Whole100003553yago:Wikicat9th-centuryAstronomersyago:Wikicat9th-centuryIranianPeopleyago:Wikicat9th-centuryMathematiciansyago:WikicatPersianAstronomersyago:WikicatPersianMathematicians New Facet based on Instances of this Class

Ahmad ibn 'Abdallah Habash Hasib Marwazi (766 - d. after 869 in Samarra, Iraq ) was a north-eastern Iranian astronomer, geographer, and mathematician from Merv in Khorasan who for the first time described the trigonometric ratios: sine, cosine, tangent and cotangent. He flourished in Baghdad, and died a centenarian after 869. He worked under the Abbasid caliphs al-Ma'mun and al-Mu'tasim.