Hipparchus was one of the first mathematicians who trigonometrically defined his astronomical observations through stereographic projection …
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Hypatia lived in Alexandria in the fourth and fifth centuries as a mathematician and philosopher. However, she is most famous for the way in which she died.
If you are interested in learning more about the astrolabe, as well as how to make one, here are several links that will point you in the right direction. (pun intended)