Comment 4 for bug 1559657

I sent another mail, but it doesn't appear here...
this is the contents of it

my intent is to explain to my site readers the motion of Saturn as seen from Pan
at this stage (before publishing anything) I'm only verifying that Stellarium algorithms and computations are correct, with null values for the inclination, with less care for real values.
but I can't explain wobbling...

I have done other tests involving Pan's orbital elements...
- increasing the distance of Pan, beyond the "ring_outer_size=140390", the wobbling effect disappears and rings are always edge-on
- decreasing it, the wobbling is always present and not so easy to understand, if not for a "strange" graphical modeling of the rings in Stellarium, that perhaps involves an inclination of the rings...

nowhere I found that rings of Saturn have an inclination: what about stellarium model "saturn_special" or else?
a small inclination of the ring plane to Saturn equatorial plane could explain the effect I found...
that sounds interesting!

BTW if you give a look at Celestia, there is no such effect...