Drawing, by Matthew Paris, from the Liber Experimentarius of Bernardus Silvestris. Euclid holding a sphaera and looking through a dioptra. Beside him sits Hermann of Carinthia, a mediaeval translator of Arab works on astronomy, holding an astrolabe. Dated 13th Century

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
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Keywords: 13th, ages, arab, artist, astrolabe, astronomy, bernardus, carinthia, century, dioptra, drawing, euclid, experimentarius, hermann, liber, matthew, mediaeval, middle, paris, silvestris, sphaera, translator