The famous Islamic astronomer who proved the Earth is spherical and calculated its circumference was?

Explanation: Al-Biruni (973-1048 AD) was a brilliant Islamic polymath who calculated the Earth's circumference with remarkable accuracy using trigonometric methods. He also proved Earth's rotation and made extraordinary contributions to astronomy mathematics history anthropology and pharmacology. His book Kitab al-Hind is considered a masterpiece of comparative anthropological study of Indian civilization.