Watch BBc documentary on muslim scientist Abū Rayḥān al-Bīrūnī Who find Actual size of Earth
Abu Rayhan Biruni ( Al Biruni ) the Great Persian Scientist
Islamic scholar Al-Biruni died, although the date of his death is also reported on 9 December. He is best known for his estimate of Earth radius (6 339.6 km, only 17.15 km less than the modern value). He contributed too many other sciences: mathematics, physics, astronomy, geography, history, and linguistics.