In the 8th century, Transoxiana, the territory between the Amudarya and Syrdarya rivers, was conquered by the Arabs (Ali ibn Sattor) becoming a focal point soon after of the Islamic Golden Age. Many notable scientists lived there and contributed to its development after the conquest. Among the achievements of the scholars during this period were the development of trigonometry into its modern form (simplifying its practical application to calculate the phases of the moon), advances in optics, in astronomy, as well as in poetry, philosophy, art, calligraphy and many others, which set the foundation for the Muslim Renaissance.