How Eratosthenes Measured the Earth 2200 Years Ago with Just a Stick!

Long before satellites and modern technology, one man measured the Earth with nothing but shadows, math, and genius. In 240 BC, Eratosthenes calculated Earth’s circumference with amazing accuracy — using a stick, the sun, and a simple angle of 7.2°. This video reveals: 🌍 The ancient experiment that proved Earth is round 🌞 How parallel sun rays unlocked the secret 📐 Eratosthenes’ calculation: 40,000 km circumference! ⚡ A scientific breakthrough that changed history #History #Science #Eratosthenes #invention #technology #education 👉 If you love science and history, hit Subscribe for more amazing discoveries!