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<h1>Run-time Environment</h1>

<p class="abstract">
Setting of run-time environment can be used to modify of global parameters.
</p>


<h2 id="fitsenv">FITS environment variables</h2>

<p>
  FITS environment variables are commonly used to redefine a value of keywords
  of a FITS header.
For instance, FITS_KEY_FILTER - redefines FILTER keyword, etc. Other variables available
(sometimes required
  during processing) are listed in <a href="man_setup.html">table</a>.
  For example, when your local conventions
stores the exposure time in record labeled by EXPOSURE keyword
</p>
<pre>
...
EXPOSURE =               20.000 / [s] Exposure time
...
</pre>
<p>
use FITS_KEY_EXPTIME="EXPOSURE". Variables can be preset as:
</p>
<pre>
$ FITS_KEY_DATEOBS="DATE-BEG"
$ export FITS_KEY_DATEOBS
</pre>

<p>
For convenience, these variables can be set under Unixes as system-wide
in /etc/profile (or /etc/bash.profile, /etc/bashrc or etc.) or on per-user base in $HOME
directory: $HOME/.profile (or $HOME/.profile or $HOME/.bashrc or etc).
</p>


<p>
  The identifiers (following prefix FITS_KEY_) should be
  unlike to FITS keywords. That conversion
  suppress confusion of the minus sign character (-) inside shell scripts.
</p>

<p>
The area of detector is <i>π(R<sup>2</sup>-r<sup>2</sup>)</i> for Newtonian reflector,
where <i>R</i> is radius of a primary mirror and <i>r</i> is radius of projection
of secondary mirror (of secondary shadow). The area of detector will be used
for photometry calibration.
</p>


<h2>Internationalization</h2>

<p>
There is effort to made Munipack locale-friendly. Unfortunately
locale setting will surprisingly interfere with both FITS
and Virtual Observatory pragmatic conventions
where non-Ascii characters are forbidden. The limitations
is much worse, just only <a href="http://en.wikipedia.org/wiki/ASCII">ASCII</a>
32 - 125 (in decimals) characters are allowed.
</p>

<p>
There are situations when use of locale-specific conventions
must respect:
</p>
<ul>
<li>Virtual Observatory supports just the dot as the floating-point separator.</li>
<li>Values in header and table of FITS must use dot as the floating-point separator.</li>
<li>FITS extended filenames (separation of dimensions by comma)</li>
</ul>


<p>
Typical encountered problems are decimal-point related.
Commas can be used both for separation of fractions
and separations of numbers each other. To prevent the
difficulty, one replaces <samp>X,Y</samp> to
<samp>"X Y"</samp> (comma is replaced by a space and enclosed
to apostrophes or quotes).
</p>


<p>
In doubts, it is recommended switch-off locales by the setup
</p>
<pre>
$ LC_ALL=C; export LC_ALL
</pre>
<p>
which will leave rest of your system unaffacted.
</p>



<h2>Run-time</h2>

<code>
MUNIPACK_LIBEXEC, MUNIPACK_BIN
</code>
<p>
  Set path(s) for executable Munipack's <a href="modules.html">modules</a>.
  The values are set during installation and used very rarely, perhaps
  for testing purposes.
</p>

<code>
MUNIPACK_CATCONF_PATH
</code>
<p>
A path pointing to the local configuration file for Virtual Obseravtory
catalogues.
</p>




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