I always think of planispheres when I think of astrolabes! Navigators used these ancient devices to provide an accurate map of the stars in the sky. To use them you would match up the metal plates to the sky and you could calculate your location. Astrolabes date back to 220BC but one with Hebrew and Arabic markings was found and it is thought to have originated back in the 11th Century.
Having seen the astrolabe online, Dr Gigante visited the museum to study it up close. She reports “When I visited the museum and studied the astrolabe up close, I noticed that not only was it covered in beautifully engraved Arabic inscriptions but that I could see faint inscriptions in Hebrew. I could only make it out in the raking light entering from the window. I thought I might be dreaming but I kept seeing more and more. It was very exciting.
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