Scientists who worked on qibla determination

Habash al-Hasib al-Marwazi

Ahmad ibn 'Abdallah Habash Hasib Marwazi (766 - d. after 869 in Samarra, Iraq ) was a north-eastern Iranian astronomer, geographer, and mathematician from Merv in Khorasan who for the first time described the trigonometric ratios: sine, cosine, tangent and cotangent. He flourished in Baghdad, and died a centenarian after 869. He worked under the Abbasid caliphs al-Ma'mun and al-Mu'tasim. (Wikipedia).

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Related pages

Cosine | Degree (angle) | Trigonometric functions | Sexagesimal | Tangent | Circumference | Trigonometry | Cotangent | Radius | Diameter