Thursday April 6th the outer planet Saturn begins its retrograde motion. This is an apparent motion that Saturn or any outer planet, dwarf planet,or asteroid has when compared to the faster moving Earth. The Earth, moving more quickly around the Sun than an outer object, will catch up and pass by the outer object sort of like a car passing a slower moving car.
As the faster moving Earth passes by, the outer object appears to stop its eastward direct or prograde motion, and then moves westward, or retrograde, for a while until it again stops before resuming its prograde motion. Saturn will remain in retrograde until June and will travel westward out of Sagittarius the Archer into the boundaries of Ophiuchus the Healer.