(n.) The curved path which a body describes in space; as, the trajectory of a projectile or satellite\.

air lane altitude peak aphelion apogee astronomical longitude automatic control autumnal equinox beat blast-off burn burnout ceiling celestial equator celestial longitude celestial meridian circle circuit colures course descent ecliptic end of burning equator equinoctial equinoctial circle equinoctial colure equinox flight flight path galactic longitude geocentric longitude geodetic longitude great circle heliocentric longitude ignition impact itinerary launch lift-off line longitude meridian orbit path perigee perihelion period primrose path road rocket launching round route run sea lane shoot shortcut shot small circle solstitial colure tour track trade route traject trajet velocity peak vernal equinox walk zodiac zone