The astrolabe was an instrument that had been used by the ancient Greeks to calculate the position of the sun and stars. Muslim astronomers improved the astrolabe around 850 A. D. With the use of the astrolabe, Muslim geographers were able to A. predict earthquakes and other natural disasters. B. calculate the size and circumference of the Earth. C. create maps of all of Africa and Asia. D. be the first people to sail around the world. ASAP!!!
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