Thābit ibn Qurra, Iraqi physician, astronomer, and mathematician (b. 826)
Al-Ṣābiʾ Thābit ibn Qurrah al-Ḥarrānī (Arabic: ثابت بن قره, Latin: Thebit/Thebith/Tebit; 826 or 836 – February 18, 901) was a Mesopotamian Arab mathematician, physician, astronomer, and translator who lived in Baghdad in the second half of the ninth century during the time of the Abbasid Caliphate.

Thābit ibn Qurrah made important discoveries in algebra, geometry, and astronomy. In astronomy, Thābit is considered one of the first reformers of the Ptolemaic system, and in mechanics he was a founder of statics.