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
<[email protected]> 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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