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Jun 12, 2013 - Technological Change in 1371: The Remarkable Sundial of Ibn al-Shatir - Roger T. Bailey Ala Al-Din Abu'l-Hasan Ali Ibn Ibrahim Ibn al-Shatir (1304 � 1375) was an Arab Muslim astronomer, mathematician, engineer and inventor who worked as muwaqqit (religious timekeeper) at the Umayyad Mosque in Damascus, Syria. Ibn al-Shatir conducted extensive observations which led to some of his theoretical contributions, designed and constructed new instruments, and made advanced contributions to Islamic astronomy in the field of Planetary theory Presentation (16Mb pdf) Walking Shadow Designs - Roger's work and bio
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