Muhammad ibn Ibrāhīm al-Fazārī (Died c. 796 or 806 CE) was an 8th-century Muslim philosopher, mathematician and astronomer working in the Abbasid court in Baghdad. He is a significant figure in the history of scientific instruments, particularly for his role in introducing the Indian system of astronomy to the Islamic world.
Al-Fazari is most famously credited with creating the first Islamic astrolabes. These intricate devices were the earliest portable “computers”, used for solving problems relating to time and the position of the Sun and stars, which were vital for navigation and religious observance.