geostationary

geostationaarinen, geostationäärinen At a fixed distance in three dimensions relative to a particular point on the Earth's surface; generally only possible with orbital satellites.
1971: Thomas A. Croft, Measurement of a Solar Wind Plasma Stream which Endures Several Months But is Intermittent on a Time Scale of about One Day http://books.google.com/books?vid=0JYtD7ICGTfuUvacezdWnn5&id=lzMFAAAAIAAJ&dq=geostationary+date:1500-1975&q=geostationary%20date:1500-1975&pgis=1

The measurement is accomplished by observing the Faraday rotation angle of signals from geostationary satellites on a continuous basis.