Empirical Earth · The Boomerangs — Flat-Earth Proofs That Backfire

“A telescope brings the ship back”

The claim

“A telescope brings a vanished ship’s hull back, so there is no curve.”

What is measured

A 2 m viewpoint sees ~5 km to the horizon. Zoom magnifies but never raises that line, so a hull below it stays hidden, unless refraction (which needs a curve) lifts it. More on refraction and the curve.

What would show this is wrong

a partly-hidden ship whose hull is restored by magnification alone, with the observer’s eye at a fixed height; or a ship that stays equally hidden when the observer climbs from the beach to a 20 m gallery. Both tests are free, and either one would settle it.

Sources

  1. Terrestrial refraction & looming (long-distance sightings). Over water only a tall object’s top clears the horizon while its base is hidden by curvature; dramatic full-skyline views (e.g. Ch link
  2. The standard coefficient of terrestrial refraction. Gauss measured the coefficient near Hannover at k ≈ 0.13; surveyors model the effect as an enlarged effective Earth radius R′ = R/(1−k) (t link
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