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A photograph of Blackpool Tower taken from North Wales illustrates this point. Despite the tower being well within the theoretical visible horizon distance according to Earth's curvature, it's not visible from the distant observer point. If the Earth were flat, the entire tower should be visible, revealing a disconnect with flat Earth claims.
The Impact of Earth's Curvature
On a globe, line of sight naturally skims along the Earth's surface, meaning distant objects are hidden by curvature regardless of atmospheric conditions—a phenomenon confirmed through multiple long-distance observations from high vantage points.