عمر خیام — ریاضیدان، ستارهشناس و شاعر رباعیات
Ghiyath al-Din Abu al-Fath Omar ibn Ibrahim al-Khayyam (1048–1131), known as Omar Khayyam, was one of the greatest mathematicians and astronomers of the medieval world. Born in Nishapur, Khorasan, he solved third-degree (cubic) equations geometrically and algebraically — a breakthrough that predated European algebra by centuries.
As court astronomer to Sultan Malik Shah I, Khayyam led the reform of the Islamic calendar, producing the Jalali calendar in 1079 — arguably more accurate than the Gregorian calendar, with an error of only one day in 3,770 years. This reformed calendar is the basis of the modern Iranian solar calendar.
In the West, Khayyam is best known through Edward FitzGerald's 1859 translation of his Rubaiyat — 100+ four-line stanzas (rubai) meditating on wine, love, mortality, and cosmic uncertainty. Though controversial among Persian scholars for their free adaptation, FitzGerald's Rubaiyat became one of the bestselling poetry collections in Victorian England.
Khayyam developed a general theory for solving cubic equations geometrically using conic sections. He also contributed to algebra, number theory, and the reform of the Iranian calendar.
The Rubaiyat is a collection of quatrains (rubai) attributed to Khayyam, meditating on wine, love, time, and uncertainty. FitzGerald's 1859 English translation made it globally famous.