[Kstars-devel] Re: polar view

[David Powell]

hi Akarsh
guess i need to clarify the problem a bit more
probably best way would be to explain the problem i guess

best observation angle is vertical (shortest path though the atmosphear)
if using a polor mount on the scope then you avoid the need for the scope to
have to reach its rotation point like on the "horizontal"/alt az system
if you are using kstars to look at the point directly above  then as you may

know  panning around there the view rotates around that point
making it hard to both get your bearings properly
if using kstars with a connected polar mount scope then that view rotation
axis should
be alligned to the celestial pole where it has the same problem
one of the advantages of using a polar mount is it that the aria directly
above can be photographed
without having actual fov rotation during a exposure

this way  other than rotation of the fov to compencate is perferabe and a
lot more pratical to follow whats happening
as the sky rotation point  matches the equipment setup
then the fov rotation correction is only needed to correct the rotation of
the cam angle on the tube of the scope itself as just a user setable offset
value

from the programming side i guess its as easy eather way to manage this but
from a usage point of view
if fov only rotation is used then it would be fair to say ..
that trying to interprate the fact that your view is using one rotation axis
and the scope fov using another at
although the scope and fov view are correctly displayed trying to
intrerprate the view angle and navigate it as displayed is tricky to say the
least

Regards
David


On Fri, Dec 10, 2010 at 10:11 AM,  Simha <akarshsimha at gmail.com> wrote:

> >    quick description
> >    is it possible to add a* polar based view as well as the default
> alt/az
> >    system
> >
> >    longer discription
> >    when using kstars the view is as it would be for a alt az mount** ie*
> >    centered on the location with the views rotation
> >    based on the point directly above
> >    if using a polar mount on a telescope connected to it via inid then
> the
> >    displayed data should* be rotated around the pole
> >
> >    mainly if you set the fov symbol to a rectangle to display the fov of
> an
> >    attached cam then it is at the wrong rotation for the actual
> >    fov* amongst other things
>
> Hi David
>
> I don't understand your point completely. As far as I know, the
> "Horizontal Coordinates" mode (I think it's now called "Switch to
> Horizonal View") in one of the menus uses Alt-Az coordinates.
>
> Firstly, the FOV symbols still don't rotate -- they are fixed
> horizontally, which is unfortunate, and that's something we must
> change very soon.
>
> But what you are saying, I guess, is (once we get them to be
> rotatable) that they should rotate as expected by slewing a telescope
> on an alt/az mount. I think that should be doable to.
>
> I'll try to do this after 15th December. This might be an interesting
> GCI task as well.
>
> Regards
> Akarsh
>
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