Paths / Measure the Earth Yourself
Measure the Earth Yourself
From a shadow in Alexandria to measuring the planet's radius with map software - the same measurement, 2,250 years apart, and you can do every step.
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Eratosthenes c. 276-194 BCE
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Eratosthenes' Shadow (240 BCE) 📐 Measuring the Earth
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Measuring the Circumference with Google Maps 🌅 Horizon & curvature
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Sextant Math: How the Stars Give You Your Position 📍 Navigation
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The $10,000 Sextant Challenge 19 Feb 2022