The illumination of the clouds by the sun after it has sunk below the horizon is evidence that the world is round.

Question

Quizplus · Accepted Answer

When the sun sets below the horizon, the curvature of the Earth causes it to continue to illuminate the sky for a short time. This phenomenon, known as the "twilight glow," appears on the tops of distant clouds before the lower portions of the clouds, proving that the Earth is round.

The Illumination of the Clouds by the Sun After It