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 <sect2 id="calc-sidereal">
 <title>Sidereal Time module</title>
 <indexterm><primary>Tools</primary>
 <secondary>Astrocalculator</secondary>
 <tertiary>Sidereal Time module</tertiary>
 </indexterm>
 
 <screenshot>
 <screeninfo>
 The Sidereal Time calculator module
 </screeninfo>
 <mediaobject>
   <imageobject>
     <imagedata fileref="calc-sidereal.png" format="PNG"/>
   </imageobject>
   <textobject>
     <phrase>Sidereal Time</phrase>
   </textobject>
 </mediaobject>
 </screenshot>
 
 <para>
 This module converts between <link linkend="ai-utime">Universal
 Time</link> and Local <link linkend="ai-sidereal">Sidereal Time</link>.
 First, select a geographic location and a date for the
 calculation. Then the corresponding value for the other Time will be displayed.
 </para>
 
 <para>
 There is a batch mode for this module.  To use it, simply
 generate an input file whose lines each contain values for
 the input parameter: <guimenuitem>Compute sidereal time</guimenuitem> or 
 <guimenuitem>Compute standard time</guimenuitem> from to left dropdown box.
 You can choose to set the <guilabel>Date:</guilabel> and <guilabel>Location:</guilabel> in the
 current window, or you can tell &kstars; to read these values from the <guilabel>Input file:</guilabel>.
 Then specify the input and output filenames, and press the
 <guibutton>Compute</guibutton> button to generate the output
 file. The output file will contains values for the complementary parameter. For example,
 if your input file contains a set of <quote>standard time</quote> values, then each line of
 the output file will contain values for <quote>sidereal time</quote>.
 You can read the output directly in &kstars;
 by pressing the <guibutton>View output...</guibutton> button.
 </para>
 
 </sect2>