Answer: RETROGRADE

AnswerCrossword Clue
RETROGRADELike some orbits
RETROGRADELike the orbit of Halley's Comet
RETROGRADEMove backward.
RETROGRADEMoving backward.
RETROGRADEBackward; inverse
RETROGRADEMoving backward
RETROGRADEGo backward
retrogrademoving backward
retrogradegoing backwards / to cause to go back
retrogradehaving a backward motion or direction; retiring or retreating.