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The notion of a geosynchronous satellite for communication purposes was first published in 1928 ( but not widely so ) by Herman Potočnik.
The first appearance of a geostationary orbit in popular literature was in the first Venus Equilateral story by George O. Smith, but Smith did not go into details.
British Science Fiction author Arthur C. Clarke disseminated the idea widely, with more details on how it would work, in a 1945 paper entitled " Extra-Terrestrial Relays — Can Rocket Stations Give Worldwide Radio Coverage?
", published in Wireless World magazine.
Clarke acknowledged the connection in his introduction to The Complete Venus Equilateral.
The orbit, which Clarke first described as useful for broadcast and relay communications satellites, is sometimes called the Clarke Orbit.
Similarly, the Clarke Belt is the part of space about above sea level, in the plane of the Equator, where near-geostationary orbits may be implemented.
The Clarke Orbit is about long.

1.881 seconds.