Abu Sa'id Gorgani
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Abu Sa'id al-Darir al-Jurajani ( أبو سعيد الضرير الجرجاني), also spelled Gorgani, was a ninth century Persian mathematician and astronomer from Gorgan, Iran.
He wrote a treatise on geometrical problems and another on the drawing of the meridian.
[edit] Sources
H. Suter: :Mathematiker (12, 1900).