[task #15567] Converting hh:mm:ss and dd:mm:ss notations to degrees and vice vesa

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15567>

                 Summary: Converting hh:mm:ss and dd:mm:ss notations to
degrees and vice vesa
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Tue 03 Mar 2020 12:31:31 PM UTC
         Should Start On: Tue 03 Mar 2020 12:00:00 AM UTC
   Should be Finished on: Tue 03 Mar 2020 12:00:00 AM UTC
                Category: Table
                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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Details:

The Right ascension <https://en.wikipedia.org/wiki/Right_ascension> (RA) and
Declination <https://en.wikipedia.org/wiki/Declination> (Dec) of astronomical
objects is sometimes written as `hh:mm:ss' (for RA) and `dd:mm:ss' (for Dec).
But in some contexts we need a single standard number (in degrees for
example).

We should add a Column Arithmetic
<https://www.gnu.org/software/gnuastro/manual/html_node/Column-arithmetic.html>
operator to facilitate doing this.

But the necessary functions to convert these strings to degrees should be
written as a very generic library (taking a string, and returning a double).
This will allow us to later use it when reading table columns generally and
doing the conversion automatically.




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