Hi Bill,

Thanks for the response. In Msg 6671 I mentioned that I had found the
problem - a 3AU offset left behind from previous activities. So you
are quite right - my viewpoint had been changed and it did in fact
affect every nearby object. I had not noticed it earlier because I
mainly use guide for locating deep space objects and the affect of my
viewpoint change on those was trivial, or at least not visually obvious.

Thanks again for the great software and great service!

Regards
Jeff

--- In guide-user@yahoogroups.com, Bill J Gray <pluto@...> wrote:
>
> Hi Jeff,
>
> I don't know why this is happening... I just updated comets as
> well, and got an orbit showing C/2007 W1 where it ought to be.
> A couple of things to check:
>
> Are other things in the solar system (asteroids, planets,
> artificial satellites) where they ought to be? If everything
> is off, that suggests your viewpoint (set in the Locations dialog)
> might be someplace other than Earth.
>
> Are you using the current update from
>
> http://www.projectpluto.com/new.htm
>
> ?
>
> And if there are still problems, I'd recommend e-mailing me
> the file 'comets.dat' from your Guide folder. I'd be interested
> to see if perhaps that has become corrupted. I've heard of two
> cases over the last year in which this happened. I have no clue
> as to how either one occurred. Maybe the third case will cause
> a pattern to emerge (and a fix to be determined).
>
> -- Bill
>