active cavity radiometer irradiance monitor satellite algeria altitude american rocket society analemma anti-satellite weapon areocentric orbit areostationary orbit areosynchronous orbit argentina astronomical unit australia biosatellite brazil bulgaria bureau of aeronautics calipso canada capture orbit chile china china-brazil earth resources satellite program circle circular circular orbit climate cloudsat cold war colombia communications satellite czechoslovakia defense meteorological satellite program denmark disaster monitoring constellation dog dong fang hong i earth earth observing system earth observation satellite edward everett hale egypt ellipse elliptic orbit envisat equator escape orbit escape velocity espionage european remote-sensing satellite european space agency fasat-alfa fengyun france galaxy geocentric orbit geostationary operational environmental satellite geostationary orbit geostationary transfer orbit geosynchronous orbit germany global positioning system graveyard orbit gravity recovery and climate experiment greece halo orbit heliocentric orbit heliosynchronous orbit hohmann transfer orbit horseshoe orbit hour hours human hydros icesat ikonos imint image imaging impulse inclination inclined orbit india indonesia international designator international geophysical year international space station ionosphere iran iraq israel italy japan jules verne kazakhstan kerim kerimov korea aerospace research institute korea space launch vehicle lagrangian point laika landing landsat program latitude liquid hydrogen liquid oxygen lissajous orbit list of earth observation satellites list of orbits low earth orbit luxembourg measat malaysia mars marshall space flight center medium earth orbit metop meteoroid meteorology meteosat mexico mile military milky way minute molniya orbit month moon multi-functional transport satellite nasa npoess national science foundation natural satellite netherlands new millennium program nigeria nimbus program nitrogen north korea norway otrag orbit orbital eccentricity orbital period orbital speed orbiting carbon observatory outer space philippines physical body planet poland polar orbit portugal preliminary design of an experimental world-circling spaceship press trust of india project gutenberg project orbiter project vanguard propellant quickbird quikscat rand radio radio jamming radioisotope thermoelectric generator remote sensing romania rotation russia seasat sunsat satellite catalog number satellite internet access satellite formation flying satellite phone satellite radio satellite television sattalites saudi arabia seawifs second semi-synchronous orbit shadow short story smallsat solar radiation and climate experiment solar system solar time south africa south korea soviet union space race space debris space station spacecraft spacecraft propulsion spaceflight spain sputnik crisis sputnik program spy satellite subsynchronous orbit sun sun-synchronous orbit sweden synchronous orbit synonym television infrared observation satellite terrasar-x tether tether satellite thailand the atlantic monthly the brick moon timeline of artificial satellites and space probes tropical rainfall measuring mission tundra orbit turkey ukraine united arab emirates united kingdom united nations united states united states air force united states navy united states space surveillance network velocity venezuela vietnam wresat walter hohmann weather weather satellite week white house wireless world year