Riddle me this

Describe recession in the procession of the planets.

 

Isn't it the same thing as retro-grade motion?

 

Yeah, they're the same thing, except recession usually describes economic depression.

 

That's where the word Retreat comes from. RECEDE. Meaning, to reverse course. As it applies to this question.
Etymology is becomming a hobby for me.

 

As they go about the sun they slowly start to wander off of their course and slow down.

 

It's an optical illusion created by the motion of the planets from our own moving platform. It also appears that the Sun revolves around the Earth.

Careful observation and analysis make the actual motions clear.