<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>
