Al-Biruni’s Earth’s Radius Measurement: The Math That Stunned Science
More than 1,000 years before GPS satellites, a scholar standing on a mountain peak in present-day Pakistan calculated the Earth’s Radius — alone, without telescopes, computers, or space technology. His answer was off by less than 1% from what we know today. His name was Abu Rayhan Al-Biruni, and his method was so elegant it…