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 <sect2 id="calc-angdist">
 <title>Angular Distance module</title>
 <indexterm><primary>Tools</primary>
 <secondary>Astrocalculator</secondary>
 <tertiary>Angular Distance module</tertiary>
 </indexterm>
 
 <screenshot>
 <screeninfo>
 The Angular Distance calculator module
 </screeninfo>
 <mediaobject>
   <imageobject>
     <imagedata fileref="calc-angdist.png" format="PNG"/>
   </imageobject>
   <textobject>
     <phrase>Angular Distance</phrase>
   </textobject>
 </mediaobject>
 </screenshot>
 
 <para>
 The Angular Distance tool is used to measure the angle between any
 two points on the sky.  You simply specify the
 <link linkend="equatorial">Equatorial coordinates</link> of the
 desired pair of points, and then obtain the angle between
 the two points.
 </para>
 <para>
 There is also a Batch mode for this module.  In batch mode, you
 specify an input filename which contains a number of parameters (up to four) on each line:
 the initial right ascension (RA), initial declination (Dec), final right ascension and
 final declination. By default, each line should contain four numbers signifying
 the RA and Dec values for pairs of points.  Alternatively, you can
 specify a single value for any of these four coordinates in
 the calculator panel (the corresponding values in the input file
 should be skipped if they are specified in the calculator).
 </para>
 <para>
 Once you have specified the input filename and an output filename,
 simply press the <guibutton>Run</guibutton> button to generate the
 output file.
 </para>
 </sect2>