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Sky Shadows Flat Earthers Can’t Explain: The Science Behind Contrail Shadows

What appears to be a mysterious X-shaped mark in the sky is actually a simple and beautiful result of light, altitude, and atmospheric physics. When airplanes fly at high altitudes, they release water vapor that quickly freezes and forms contrails — white trails that stretch behind the aircraft. When the sun is low on the horizon, typically near sunrise or sunset, it casts long shadows of these contrails across layers of clouds below or above them. This creates a stunning optical illusion — large dark lines that appear to slice through the sky. These are not “chemtrails” or glitches in a sky dome — they are shadows, and their existence depends on three things: the position of the sun, the altitude of the contrails, and the reflective surface of nearby clouds.

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The Flat Earth model cannot account for this phenomenon. Without a curved atmosphere, a layered sky, and a distant sun casting angular shadows, there would be no way to explain the geometry we observe. In reality, the globe Earth model — with atmospheric refraction, perspective, and light physics — perfectly predicts this occurrence. It’s one of many real-world proofs that contradict flat Earth beliefs and highlight the beauty of science in the everyday sky.

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