Many medieval astrolabes have survived, and at least three medieval equatoria are known. [Please select]
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Astrolabes and equatoria rapidly became very popular, mainly through the reason for which they had been first devised, the avoidance of tedious written computation. [Please select]
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_) Earliest extant astrolabes 1000 Geared astrolabe of al-Biruni EUROPE 1000 Gerbert astronomical model ISLAM 1025 Equatorium text CHINA 1074 Shen Kua, clocks and magnetic compass 1080 Su Sung clock built 1101 Su Sung clock destroyed INDIA 1100 (_ca. [Please select]
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