Qadi Zada

al'Rumi Qadi Zada

Born: 1364 in Bursa, Turkey
Died: 1436 in Samarkand, Uzbekistan

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Qadi Zada was professor of mathematics at Samarkand where Ulugh Beg was a student an his classes. After the death of al'Kashi, Qadi Zada became director of the Samarkand Observatory.

He determined the value of the sine of an angle, computing sin 1degrees to an accuracy of 10^-^1^2 (if expressed in decimals). He worked most of his life computing tables.

References:

  1. Dictionary of Scientific Biography
  2. A Adivar, Osmanli Türklarinde Ilim (Istambul, 1943). 
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JOC/EFR February 1996