Abu al-Wafa al-Buzjani

Full Name: Abu al-Wafa Muhammad ibn Muhammad ibn Yahya ibn Ismail ibn al-Abbas al-Buzjani or Abu al-Wafa Buzhjani

Arabic: ابو الوفا بوزجانی

Born: 940 AD

Origin: Buzjan, Iran

Dies: 998 AD

Famous for: Mathematician and Astronomer

Contribution:

Negative numbers in a medieval Islamic text

Innovations in spherical trigonometry

First to build wall quadrant to observe the sky

He defined the tangent function

Articles

https://en.wikipedia.org/wiki/Abu_al-Wafa%27_al-Buzjani

https://www.britannica.com/biography/Abu-al-Wafa

https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/abu-al-wafa