--- In [email protected], John Mahony
<[EMAIL PROTECTED]> wrote:
>
> ----- Original Message ----
>
> > From: ulrichkorth <[EMAIL PROTECTED]>
> >
> > Hi John and Chris,
> > I think I'v got it now. Our mount is parallactic.
>
> Huh?
Parallactic - better known as polar mount?... Ulrich
>
> > So CdC sends RA
> > and Dec to mount controller, which then will calculate AltAz
> > regarding time. Mount then goes to AltAz. As this will last some
> > time, controller has to recalculate AltAz. When target is
reached,
> > normal guiding in Az will start.
>
> If it's only moving in az, it won't track objects across the sky.
>
> -John
>
>
> > All OK? Can I do it in this way??
> >
> > Ulrich
> >
> > --- In [email protected], John Mahony
> > wrote:
> > >
> > > Since the relation between alt-az and RA-dec coordinates is
time-
> > dependent, if CdC were to send alt-az coordinates for pointing,
it
> > would have to know how fast your scope moves, so it could send
the
> > scope to where the object _will be_, at the time it gets there.
> > That adds even more complexity, since the "time to get there"
will
> > depend on the distance to the target. RA-dec is the sky's
natural
> > coordinate system, so charting programs start with that.
> > >
> > > I'm assuming your mount is alt-az, otherwise there's no reason
to
> > be concerned with alt-az coordinates at all. So in this case
your
> > mount controller will need to routinely do the coordinate
> > transformation anyway.
> > >
> > > -John
> > >
> > >
> > >
> > >
> > > ----- Original Message ----
> > > > From: ulrichkorth
> > > >
> > > > Hi Chris,
> > > > next question from beginner: Is it true, that NOT CdC - or
any
> > other
> > > > PC-Astro-Program - will always calculate Altitude and Azimut
but
> > > > this is task of the scope's controller itself. That was the
> > > > intention of my first question - as we build the scopes
> > controller
> > > > ourselves we would like not to calculate here - but would
like
> > to
> > > > get these data from PC, which has more calculation power and
> > more
> > > > accuracy.
> > > > Ulrich
> > > >
> > > > --- In [email protected], Chris Rowland
> > > > wrote:
> > > > >
> > > > > Ra and Dec are better for pointing to celestial objects
> > because
> > > > they
> > > > > don't change as the Earth rotates.
> > > > >
> > > > > Look for ASCOM for a way to communicate with Ceil.
> > > > >
> > > > > Chris
> > > > >
> > > > > ulrichkorth wrote:
> > > > > > Hi sky friends,
> > > > > > we are beginners and want to use ciel. The communication
to
> > > > teleskope
> > > > > > works well. But why does ciel only send RA and DEC and
NOT
> > also
> > > > ALT
> > > > > > and Azimut??
> > > > > > As we are building the teleskope control and SW
ourselves it
> > > > would be
> > > > > > easier to have ALT and Azimut from ciel.
> > > > > >
> > > > > > For some help and advice we would be very thankful.
> > > > > >
> > > > > > Kind regards
> > > > > > Ulrich and Michael Korth
> > >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
