celestia: good tool but...

Hi, I am trying to use "celestia" a free very good planitarium for
simulations.
My question: is it possible to use an absolute reference system?
I centered on sun north pole, but the sun rotates, so I don't see what
I expected :-(
is it possible to center on an object e.g. external to solaris system
that doesn't move, doesn't rotates and so on...
thanks in advance for your suggestions
Marco