Omar Khayyam

1048–1131 CE Nishapur, Persia Mathematics, Astronomy & Poetry

Key Contribution: Developed the most accurate calendar of his era. Solved cubic equations geometrically.

Preceded the West: His Jalali calendar was more accurate than the Gregorian calendar, which came 500 years later.

Ghiyath al-Din Abu al-Fath Umar ibn Ibrahim al-Khayyam was a Persian mathematician, astronomer, philosopher, and poet. In mathematics, he classified and systematically solved cubic equations using geometric methods, representing a major advance in algebra. He also recognized that certain cubic equations have two solutions and wrote on the generalization of the binomial theorem. In astronomy, he led the reform of the Persian calendar, producing the Jalali calendar — which measured the length of the year as 365.24219858156 days, more accurate than the Gregorian calendar introduced 500 years later. In the West, he is best known for the Rubaiyat, his collection of quatrains translated by Edward FitzGerald in 1859, which became one of the most popular poetry collections in the English language.