How the Planets Move Against the Stars

I photographed each of the six outer planets twice, 24 hours apart to show their relative motions (orbital speeds) against the stars. Except for Pluto (which I admit might not even be!), one can definitely see a decrease in motion the further out you go. Note the moons of Saturn and Jupiter, and that Saturn and Neptune "appear" to be moving in retrograde. Neptune moves so little because it just changed apparent direction.