Hemisferium Planispheric Astrolabe L.H.V. 20 √∏ H35Planispheric (Catholic or European) astrolabe, set for 41 latitude. Specially developed by Hemisferium with classic Renaissance design. Astrolabe, from the Greek, star searcher, was introduced to Europe by the Arabs in the early 12th century. It became a vital tool for astronomers, astrologers, and surveyors. This astronomical computer was used to estimate the time, to measure heights of celestial bodies and geographical accidents, determine the local