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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Geosynchronous Satellite  
  A satellite that appears to "hover" over one spot on the earth's surface; it goes around the earth in twenty-four hours.  

Herman Potočnik published a book proposing that it was possible to live in space in 1929. In it, he talked about inhabited space stations in geostationary orbit. Clarke expanded on this idea, proposing a trio of devices poised over the earth and able to communicate with each other in direct line of sight.

An 'artificial satellite' at the correct distance from the earth would make one revolution every 24 hours, i.e., it would remain stationary above the same spot and would be within optical range of nearly half the earth's surface. Three repeater stations, 120 degrees apart in the correct orbit, could give television and microwave coverage to the entire planet.
From V2 for Ionospheric Research, by Arthur C. Clarke.
Published by Wireless World in 1945
Additional resources -

The period of revolution of a satellite around the earth is fixed by its distance from the center of the earth. It just so happens that if you put a satellite in orbit 22,300 miles above the earth's surface in the same direction as the earth's rotation, it will appear to stand still above the same spot. Compare this to the International Space Station, only about 250 miles above the surface of the earth, which goes once around the earth every 90 minutes or so.

The first geosynchronous satellite was Syncom 2. Syncom was a program of three experimental, active communication satellites which was started by NASA in 1961

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Additional resources:
  More Ideas and Technology from V2 for Ionospheric Research
  More Ideas and Technology by Arthur C. Clarke
  Tech news articles related to V2 for Ionospheric Research
  Tech news articles related to works by Arthur C. Clarke

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