Astrolabe ~ 10th c. ~ Islamic, Umayyad, Spain ~ The astrolabe is a very ancient astronomical computer for solving problems relating to time and the position of the Sun and stars in the sky. The most popular type is the planispheric astrolabe, on which the celestial sphere is projected onto the plane of the equator.
Astrolabe Signed by Erasmus Habermel circa 1585; German Gilt brass and copper; 195 mm in diameter This instrument is engraved by Paduanius of Forli in Italy, a physician for whom Erasmus Habermel made some 28 instruments between 1585 and 1586. Among the patients of Paduanius was Rudolf II, for whom Habermel would act as instrument maker in Prague. Museum of the History of Science, Oxford
Persian astrolabe c.1645 CE by Muhammad Mahdi al-Yazdi. Very unusually for a Persian astrolabe, the astrolabist included a Flemish tulip design within the ecliptic of the rete--he must have seen and been inspired by an Arsenius instrument.