WE'RE GOING BACKWARDS
'(<a href="http://www.j-archive.com/media/2010-05-31_DJ_14.wmv">Sarah of the Clue Crew shows an astronomical animation on the monitor.</a>)  From Earth's point of view, shown here by the red line, planets sometimes appear to reverse direction because the Earth overtakes them in their orbits; the backward motion is called this--from the Latin for "walking backward"'
retrograde