Habash al-Hasib al-Marwazi (766 – d. after 869 in Samarra, modern Iraq[1]) was a Persian[2][3] astronomer,[4] geographer, and mathematician from Merv in Khorasan, who was the first to describe the trigonometric ratios tangent, and cotangent.
Habash flourished in Baghdad, and died a centenarian some time after 869. He worked under two Abbasid caliphs, al-Ma'mun and al-Mu'tasim.
Habash al-Hasib al-Marwazi | |
---|---|
Born | Habash al-Hasib al-Marwazi 766 AD Merv |
Died | 869 AD Samarra |
Nationality | Persian |
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: CS1 maint: archived copy as title (link)