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Comment: It depends on your height above the water. You could only see 20 miles if you were well above sea level. If â¦you are standing more or less at sea level, with your eyes just a few feet above the water level, you could see only about 3 or 4 miles. For example: Eye level at 6 feet: horizon at about 3 miles.
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.