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Absolutely no curvature of the earth can be seen. And the camera does a 360 turnaroundâ¦ The horizon is always at the eye-level. Logically, on a ball-earth, the horizon should be gradually lower as we go up in the air. The curvature of the earth should be seen far under 110 000 feets according to the Earth Globe theory. Open your eyes and see the evidence.
For a sphere, those two lines are parallel, which means they can never meet at your eye and you can never see both edges of a sphere at the same time. The Earth is almost a perfect sphere. So, neglecting distortion due to Earth's atmosphere, the strict answer to your question is: you must be an infinite distance away. Certainly, you've got to go farther than the International Space Station (240 miles), where you can only see about 5% of the full hemisphere Earth.