I'm not really sure what you mean by erratic movements of some of the planets. But that part of Nassim Harameins doesn't conflict with mainstream
science as I understand it. The planets orbit the sun and the whole solar system moves up and down in the milky way. I think it's usually referred to
as wobbling and one wobble takes tens of thousands of years (I seem to remember it's about 26.000 years but that may be wrong.)
But given these mechanics each planet can be seen as moving in a spiral, though the spiral obviously wouldn't be getting smaller or the the planets
would crash into the sun and probably each other.
Hope this helps

