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A replica of a medieval astrolabe which is a navigation instrument capable of 43 different astronomical calculations Stock Photo - Alamy
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Photo libre de droit de Madieval Laiton Astrolabe Un Instrument Astronomique De Navigation banque d'images et plus d'images libres de droit de Astrolabe - iStock
![23. Astrolabe by Regnerus Arsenius, Louvain, 1565 - Museum of the History of Science : Museum of the History of Science 23. Astrolabe by Regnerus Arsenius, Louvain, 1565 - Museum of the History of Science : Museum of the History of Science](http://www.mhs.ox.ac.uk/wp-content/uploads/53558.jpg)