🌍✨ Columbus didn’t prove the Earth was round—Al-Biruni did it 600 years earlier. 🪧 In the 11th century, Abu Rayhan Al-Biruni climbed a mountain with just a stick, measured the horizon’s angle, and used 📐 trigonometry to calculate Earth’s radius—coming within 1% of 🚀 NASA’s data today. 🧠 He also mapped ⏰ time zones, studied 🌐 languages, and even debated with Avicenna (Ibn Sina). A true polymath of the Islamic Golden Age, yet left out of most textbooks. 📲 Next time you check the time across
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🌍 Did a Muslim man really measure the Earth’s radius without satellites?! 📜 In the 10th century, Al-Biruni—born in what is now Uzbekistan—used nothing but shadows, a mountain, and math to estimate Earth’s size… and his answer was within 1% of today’s value. 🧠 He also mapped time zones, studied languages, and even debated with Avicenna (aka Ibn Sina)—drama included. Yet he’s still left out of most textbooks. 🕰️ Next time you check the time in another country, remember: Al-Biruni walked so GPS
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