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You can never see the whole surface of any sphere. The most you can see, even theoretically, is exactly half (50%), but even that requires that you be infinitely far from it. How much of the earth you can see depends on how far you are from it. The farther you are, the more you can see. The limits are: -- None at all (zero%) from zero distance (when your eye is on the ground); -- Half of the surface (50%) from an infinite distance. From the position of a geosynchronous satellite ... in an orbit about 22,000 miles above the equator ... it can see (and be seen from) all of the earth's surface inside a circle with a radius of about 70 degrees, i.e. between latitudes 70 degrees north and south, and between longitudes 70 degrees east and west of the satellite's longitude.

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16y ago

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