hm, I leave town for a few days and first the servers are trashed, then the backup fails and now the mail servers are off line. oooee.
my deepest sympathies to those who lost /home the week before lectures began.
anyway, e-mail has been inaccessible for over a day - if you need to reach me urgently, comment on this post, can call back if really needed - if you wonder what this is about, then it is not about you
Hey Steinn -- I sent you a long email yesterday with a physical argument explaining why the line of nodes circulates. Not urgent at all, since you've probably got the puzzle solved already. But a nice demonstration of why in the right geometry the rate of change of i goes like cos^2 of the planet's phase.... Feel free to post emails to me on any entry on my main website; I can always delete them after receipt if they aren't meant to stay there.