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<p><font face="Courier New, Courier, monospace">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.</font></p>
<p><font face="Courier New, Courier, monospace">/H.<br>
</font></p>
<p><font face="Courier New, Courier, monospace"></font><br>
</p>
<div class="moz-cite-prefix">Den 2021-10-13 kl. 09:13, skrev Lester
Anderson:<br>
</div>
<blockquote type="cite"
cite="mid:CAE3taFBuW0zVcJOFGZ0G49d8c5_umTaYAo=ca5R-pdKcYnuabw@mail.gmail.com">
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<div dir="ltr">Many thanks for the pointers Hernan, and clarity on
the correct orientation of the map.
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Lester</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, 12 Oct 2021 at 17:10,
Hernán De Angelis <<a
href="mailto:variablestarlight@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">variablestarlight@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><font face="Courier New, Courier, monospace">Lester,</font></p>
<p><font face="Courier New, Courier, monospace">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</font><font
face="Courier New, Courier, monospace"><font
face="Courier New, Courier, monospace">. It will
probably be some work with the styles and proper
scaling of point sizes to star magnitudes.</font></font></p>
<p><font face="Courier New, Courier, monospace">/H.</font><br>
</p>
<div>Den 2021-10-12 kl. 13:56, skrev Lester Anderson:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hello,
<div><br>
</div>
<div>Is there a simple way of plotting star charts using
Right Ascension and Declination, with proper scaling,
without converting Right Ascension to degrees?</div>
<div><br>
</div>
<div>Would like to create both a rectangular plot and
North South polar plots.</div>
<div><br>
</div>
<div>Thanks for any pointers</div>
<div><br>
</div>
<div>Lester</div>
</div>
<br>
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