[Qgis-user] Celestial map

[Hernán De Angelis]

Mathematically it is very simple, one only needs to multiply the X 
coordinates by -1. I am not that familiar with the QGIS Python console 
to suggest a method there, but I am almost convinced there must be one. 
Perhaps other users can give you a suggestion on this.

/H.


Den 2021-10-13 kl. 09:13, skrev Lester Anderson:
> Many thanks for the pointers Hernan, and clarity on the 
> correct orientation of the map.
>
> I do have constellation boundaries and the asterisms as shapefiles, 
> but these are oriented the normal way, e.g. Orien is on the left and 
> not the right as you mention. Cannot see an easy way of flipping these 
> files.
>
> Lester
>
> On Tue, 12 Oct 2021 at 17:10, Hernán De Angelis 
> <variablestarlight at gmail.com> wrote:
>
>     Lester,
>
>     Yes, it can be done. I believe you need to do some preprocessing
>     on your star data to convert RA to degrees (which you wrote you do
>     not want to do but is not difficult). I also guess you are aware
>     that RA coordinates (or the x axis) have to be mirrored for use in
>     geographical software because RA increases to the left, as opposed
>     to normal longitude which increases to the right. It will probably
>     be some work with the styles and proper scaling of point sizes to
>     star magnitudes.
>
>     /H.
>
>     Den 2021-10-12 kl. 13:56, skrev Lester Anderson:
>>     Hello,
>>
>>     Is there a simple way of plotting star charts using Right
>>     Ascension and Declination, with proper scaling, without
>>     converting Right Ascension to degrees?
>>
>>     Would like to create both a rectangular plot and North South
>>     polar plots.
>>
>>     Thanks for any pointers
>>
>>     Lester
>>
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