Hello Alan,

what you proposed is true for a fixed zone around the ZENITH. But Pete was
asking for a "danger zone" around the NORTH CELESTIAL POLE, which I
suppose he needs for a scope mounted on a parallactic wedge. I think this can
only be done with drawing a circle as an overlay.

Clear skies
Bernd

> Hi Pete,
>
> A long time ago, I asked Bill the same question.. luckily I kept his
> reply.
>
> Hope this helps.
>
> Alan
>
> Alan,  about having some sort of "horizon" limit for telescope
> control:  as admittedly happens too frequently in Guide,  there is
> a way to do this,  but it is not at all obvious.  You can edit
> HORIZON.DAT and add lines resembling the following:
>
> f 18 48 0 0 ; altitude cap
>    0 67
>   20 67
>   40 67
>   60 67
>   80 67
> 100 67
> 120 67
> 140 67
> 160 67
> 180 67
> 200 67
> 220 67
> 240 67
> 260 67
> 280 67
> 300 67
> 320 67
> 340 67
>
>     The above would cause Guide to draw an eighteen-point polygon
> that loops around the zenith,  at altitude 67 degrees (obviously,
> this can be readily changed) in a "danger! alert!"-suggestive red.
>
>     Not the sort of solution that leaps out at you,  I realize!
>
>
> > > Question 1. Is there any way to draw a 18° radius circle around
> > the
> > > NCP to simplify where I can't slew without crashing the scope.
> > Yes,
> > > I've set the declination limit to 72°, and the scope won't go
> > there.
> > > But Meade's software crashes if the "don't go there" limit is
> > crossed
> > > and I have to reboot and realign - a real pain. It would be
> > really
> > > nice to be able to draw a red circle indicating the limits beyond
> > > which I'll crash.
> >
> >
> >
> Alan Cahill (J94)
> Abbeydale Observatory,
> Gloucester.
> UK
> http://mountabbeydale.pwp.blueyonder.co.uk

Bernd Brinkmann

Sternwarte Herne, MPC code A18
Herne, Germany

e-mail: info@...
http://www.sternwarte-herne.de