iVillage

Pluto stands free of the channel and marks the fact that this process is not just a straight line (Saturn), not just a tangent (Uranus), not just an embracement (Neptune), but a very fine curve that wraps around the sphere, endlessly repeating this entire process, the “we are our own grandpa,” sort of thing. Very sensitive stuff.

Summary: The only purpose of this diagram is to point out that all of the planets work together as one great system, each with their particular role to play. In other words, there is only one continuous process taking place, and the symbol for this entire process is the Sun.