handcar railroad; handcar railway
trackless; reckless; dissipated
continuous track; caterpillar track
to be on track; to be going to plan; to enter orbit
course correction; trajectory change; orbital adjustment
to put on track; to make go to plan; to put into orbit; to send into orbit
geostationary orbit; geosynchronous orbit
low orbit; low earth orbit; LEO
earth orbit; geocentric orbit
heliocentric orbit; circumsolar orbit
semi-major axis (esp. in orbital matters)
ICO; Intermediate Circular Orbit
semi-minor axis (esp. in orbital matters)