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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 press the
+<guibutton>Compute</guibutton> button to 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 four numbers per line:
+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>