 Abu'l-Hasan ibn Ali al-Qalasadi

Abu'l-Hasan ibn Ali al-Qalasadi was a notable figure from the 15th century, primarily recognized for his contributions to the fields of mathematics and astronomy. He was born in 1412 in the city of Qalasād, which is located in present-day Spain. Al-Qalasadi is particularly renowned for his work in the development of trigonometry and the use of astronomical instruments.