вимірювання параметрів орбіти
inclined orbit low earth orbit
equipment modification
equipment modification list
retrofit modification kit
modification program
certification modification
approved modification of aircraft
authorized modification
helicopter modification
modification
fixed-orbit satellite
velocity in final orbit
orbit insertion propulsion
orbit transfer propulsion
orbit-raising propulsion
earth-centered orbit
elliptical orbit
geostationary orbit
geosynchronous orbit
high-apogee orbit
orbit
orbit determination
orbit insertion burn
orbit-raising mission
satellite-filled orbit
stationary orbit
variable orbit
random orbit satellite