* Ancient Greeks: The earliest known devices resembling an astrolabe can be traced back to ancient Greece, around the 2nd century BC. Hipparchus is often credited with developing the first true astrolabe, a device used to measure the altitude of stars and planets.
* Early Islamic Period: Islamic scholars significantly improved the astrolabe during the 8th and 9th centuries. Muhammad ibn Musa al-Khwarizmi was one of the most important figures, developing sophisticated mathematical techniques for astrolabe calculations.
* Medieval Europe: The astrolabe became a popular scientific tool in Europe during the Middle Ages. Gerard of Cremona translated Arabic texts on the astrolabe into Latin, making the device accessible to European scholars.
Important note: It's crucial to understand that the astrolabe wasn't invented by a single person but rather evolved through a process of refinement and innovation across cultures and time.