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Line 43: \|- valign="top" \| ''c.'' 1150 \| [[Islamic astronomy\|Arab astronomer]], [[Jabir ibn Aflah]] (Geber), may have invented or inspired the [[Torquetum]], an observational instrument and mechanical [[analog computer]] device used to transform between [[spherical coordinate system]]s.<ref>{{Cite journal\|first=R. P.\|last=Lorch\|title=The Astronomical Instruments of Jabir ibn Aflah and the Torquetum\|journal=[[Centaurus (journal)\|Centaurus]]\|volume=20\|issue=1\|year=1976\|pages=11–34\|doi=10.1111/j.1600-0498.1976.tb00214.x\|bibcode=1976Cent...20...11L}}</ref> It was designed to take and convert measurements made in three sets of coordinates: [[horizon]], [[equator]]ial, and [[ecliptic]]. \|- valign="top" \| 1206

Timeline of computing hardware before 1950: Difference between revisions