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  • Abu Hamid Ahmed ibn Mohammed al-Saghani al-Asturlabi was a Persian astronomer and historian of science. He flourished in Baghdad, where he died in 379-380 A.H/ 990 A.D. An inventor and maker of instruments, he worked in Sharaf al-dawla's observatory and, perhaps, constructed the instruments which were used there. Worked on the trisection of the angle.

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