----- Original Message ---- > From: ulrichkorth <[EMAIL PROTECTED]> > > Hi John and Chris, > I think I'v got it now. Our mount is parallactic.
Huh? > 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 > > >
