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0001 <sect2 id="calc-angdist">
0002 <title>Angular Distance module</title>
0003 <indexterm><primary>Tools</primary>
0004 <secondary>Astrocalculator</secondary>
0005 <tertiary>Angular Distance module</tertiary>
0006 </indexterm>
0008 <screenshot>
0009 <screeninfo>
0010 The Angular Distance calculator module
0011 </screeninfo>
0012 <mediaobject>
0013   <imageobject>
0014     <imagedata fileref="calc-angdist.png" format="PNG"/>
0015   </imageobject>
0016   <textobject>
0017     <phrase>Angular Distance</phrase>
0018   </textobject>
0019 </mediaobject>
0020 </screenshot>
0022 <para>
0023 The Angular Distance tool is used to measure the angle between any
0024 two points on the sky.  You simply specify the
0025 <link linkend="equatorial">Equatorial coordinates</link> of the
0026 desired pair of points, and then obtain the angle between
0027 the two points.
0028 </para>
0029 <para>
0030 There is also a Batch mode for this module.  In batch mode, you
0031 specify an input filename which contains a number of parameters (up to four) on each line:
0032 the initial right ascension (RA), initial declination (Dec), final right ascension and
0033 final declination. By default, each line should contain four numbers signifying
0034 the RA and Dec values for pairs of points.  Alternatively, you can
0035 specify a single value for any of these four coordinates in
0036 the calculator panel (the corresponding values in the input file
0037 should be skipped if they are specified in the calculator).
0038 </para>
0039 <para>
0040 Once you have specified the input filename and an output filename,
0041 simply press the <guibutton>Run</guibutton> button to generate the
0042 output file.
0043 </para>
0044 </sect2>