Abu al-Rehan Muhammad ibn Ahmad al-Biruni — Persian scholar measured the Earth's circumference.
Al-Biruni developed a formula within the 11th century to live the earth’s circumference. the necessity to calculate the scale of earth was first felt when the Abbasid Caliphate spread far and wide from Spain till Indus in modern-day Pakistan.
Muslims are required to wish facing the direction of the Kaaba and being far-flung from Kaaba doesn't spares one from this obligation. So irrespective of how far Muslims were from the Kaaba they needed to see its exact direction to wish.
To do this accurately they needed to grasp the curvature of the planet and knowing this demanded that they know the scale of the planet.
With his formula Biruni got hold of the worth of the circumference of the planet within 200 miles of the particular value of 24,902 miles, that's less then 1% of error. Biruni's stated radius of 6335.725 km is additionally very near the first value. this can be almost 99.77% same as of today's research #yusufbhandarkar
