adjective. Of, relating to, or being an orbit that has a period of one sidereal day.

adjective. Geostationary.

adjective. Refers to the orbit of a satellite whose rate of revolution is matched to the rotation period of the Earth. A special case is the geostationary orbit which is is circular and equatorial, so that the satellite appears to be fixed over a particular point on Earth's sky.

adjective. of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth)

"-- Technology development should give top priority to a demonstration solar power satellite in geosynchronous orbit;"

fixed  

Uranian  early-warning  geostationary  low-altitude  low-orbit