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Posted by Michael McNeil on February 4, 2002 00:12:40 UTC

How high do you have to be (minimum) above the surface of the earth, to see the full half-globe?

I suspect that the full 180 can never fully be seen. At 90 degrees it is not at infinity, even. Of course the earth has an atmosphere, so it will be possible.

Suppose it hadn't?

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