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Essay text:
The period of
revolution is equal to the period of
rotation of the earth with respect to the
stars, or 23 hours 56 minutes 4.1 seconds,
and thus by Kepler's third law the orbital
radius is 42,164 km. Taking into account
the radius of the earth, the height of a
satellite above the equator is 35,786 km.
Clarke observed that only three satellites
would be required to provide
communications over the inhabited earth.
As a primary application of such
a satellite system, Clarke proposed that
satellites in geostationary orbit might
provide direct broadcast television service
similar to DBS systems like DirecTV -- a
remarkable idea at a time when television
was still in its infancy and it was not yet
known whether radio signals could
penetrate the ionosphere...
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