How an Earth-Curvature Calculator Works @BobtheScienceGuy

Uploaded November 2021 | Updated September 2026, 3 weeks ago

This video derives the geometry behind an Earth-curvature calculator instead of treating it as a black box. Using the Pythagorean theorem, observer height, target distance, Earth’s radius, hidden height, and an effective-radius correction for atmospheric refraction, the calculations reproduce the calculator’s predicted horizon and visibility values.

$How an Earth-Curvature Calculator Works This video derives the geometry behind an Earth-curvature calculator instead of treating it as a black box. Using the Pythagorean theorem, observer height, target distance, Earth’s radius, hidden height, and an effective-radius correction for atmospheric refraction, the calculations reproduce the calculator’s predicted horizon and visibility values.$

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