Horizon by the Numbers: Measuring Earth’s Curve with Geometry
10 February 2026

Horizon by the Numbers: Measuring Earth’s Curve with Geometry

Intellectually Curious

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A beach-side deep dive into why the horizon is closer than it looks. We use a simple right triangle to show how eye height determines viewing distance, explore the hull-down effect, and explain how atmospheric refraction nudges the horizon a bit farther. We also debunk the eight inches per mile squared rule and illustrate how the right math confirms the planet beneath our feet. 


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