'(<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
WE'RE GOING BACKWARDS: From Earths 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
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"
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"
WE'RE GOING BACKWARDS
retrograde
WE'RE GOING BACKWARDS