[task #16440] Conversion of celestial coordinates in a table in unit.h

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?16440>

                 Summary: Conversion of celestial coordinates in a table in
unit.h
                   Group: GNU Astronomy Utilities
               Submitter: makhlaghi
               Submitted: Sat 16 Sep 2023 06:22:11 PM CEST
         Should Start On: Sat 16 Sep 2023 12:00:00 AM CEST
   Should be Finished on: Sat 16 Sep 2023 12:00:00 AM CEST
                Category: Libraries
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 16 Sep 2023 06:22:11 PM CEST By: Mohammad Akhlaghi <makhlaghi>
As of Gnuastro 0.20, only the conversion of the WCS coordinate system is
supported within a FITS image (through the '--wcscoordsys' of the Fits
program;
[https://www.gnu.org/software/gnuastro/manual/html_node/Keyword-inspection-and-manipulation.html
see documentation]). 

In other situations, it is necessary to convert a table of coordinates from
one system to another (for example through column arithmetic). We need a set
of functions for this in 'unit.h' (they can use the polar conversions that are
already available in 'wcs.h'.

The mathematics of the conversion are very nicely described in
[https://physics.stackexchange.com/questions/88663/converting-between-galactic-and-ecliptic-coordinates
this StackExchange answer].







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