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The man known in English as the poet Omar Khayyám ( May 18 1048 - December 4 1123, assumed dates) was born in Nishapur (or Naishapur) in Khorasan, Persia ( Iran), and named Ghiyath al-Din Abu'l-Fath Umar ibn Ibrahim Al-Nisaburi al-Khayyami (al-Khayyami means "the tentmaker"). His name in Persian is "عمر خیام".
He was famous during his lifetime as a mathematician and astronomer who calculated how to correct the Persian calendar. On March 15, 1079, Sultan Jalal al-Din Malekshah Saljuqi (1072-1092) put Omar's corrected calendar into effect, as in Europe Julius CaesarAlternative meanings: Julius Caesar (disambiguation). Gaius Julius Caesar ( Latin: C·IVLIVS·C·F·C·N·CAESAR) ( July 13, 100 BC March 15, 44 BC) was a Roman military and political leader whose conquest of Gallia Comata extended the Roman world all the way t had done in 46 B.C. with the corrections of SosigenesSosigenes was named by Pliny the Elder as the astronomer consulted by Julius Caesar for the design of the Julian calendar. It appears that little or nothing is known about him apart from two references in Pliny's Natural History. Some web sources say that, and as Pope Gregory XIIIGregory XIII ne Ugo Buoncampagno ( January 7, 1502 April 10, 1585) was pope ( 1572 1585). He was born Ugo Buoncampagno in Bologna, where he studied law and graduated in 1530. Afterwards, he taught jurisprudence for some years, Alexander Farnese, Reginald would do in February 1552 with Aloysius LiliusAloysius Lilius (Luigi Lilio, 1510 1576) was a physician from Calabria in Italy (at that time part of the kingdom of Naples). Lilius was one of the principal inventors of the Gregorian Calendar reform, but died before he had his plans accepted. His brothe' corrected calendar (although BritainGreat Britain (often abbreviated as Britain is an island lying off the western coast of Europe, comprising the main territory of the United Kingdom. Great Britain is also used as a political term describing the combination of England, Scotland, and Wales, would not switch from the JulianThe Julian calendar was introduced by Julius Caesar in 46 BC, taking force in 45 BC or 709 ab urbe condita''. It was chosen after consultation with the Alexandrian astronomer Sosigenes and was probably designed to approximate the tropical year, known sinc to the Gregorian calendarThe Gregorian calendar is the calendar currently used in the Western world. A modification of the Julian calendar, it was first proposed by Neapolitan doctor Aloysius Lilius, and promulgated by the eponymous Pope Gregory XIII on February 24, 1582 (Note: T until 1751, and RussiaThe Russian Federation ( Russian: , transliteration: Rossiyskaya Federatsiya or Rossijskaja Federacija , or Russia (Russian: , transliteration: Rossiya or Rossija , is a country that stretches over a vast expanse of eastern Europe and northern Asia. With would not switch until 1918).
He is also well known for inventing the method of solving cubic equations by intercepting a parabola with a circle.