Answer: People still use the astrolabe to solve the problem.
Step-by-step explanation:
Ahmad ibn Muhammad who lived in present-day Uzbekistan was one of the best astronomers who lived in present-day Baghdad in the ninth century. He mathematically explained the astrolabe (Astronomical instrument for measuring angles). He was also involved in the Tigris Irrigation Canal construction project. During the IX and X centuries, the Arabian Peninsula was the center of science and art in the world.