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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>