What are the accomplishments of Omar khayyam?

Omar Khayyam was a prominent Persian mathematician, astronomer, and poet of the 11th century. He made significant contributions to mathematics, particularly in the development of algebra and the classification of cubic equations. Khayyam also played a key role in the reform of the Persian calendar, creating a solar calendar that was more accurate than the Julian calendar. Additionally, he is widely celebrated for his poetry, especially his collection of quatrains, the "Rubaiyat," which explores themes of love, existence, and the nature of life.