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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 whether you will use Universal Time or Sidereal Time
+as an input value in the <guilabel>Input Selection</guilabel> section.
+You must also specify a geographic longitude, and a date for the 
+calculation, in addition to either the Universal Time or the Sidereal 
+Time value.  When you press the <guibutton>Compute</guibutton> button, 
+the corresponding value for the other Time will be displayed.
+</para>
+</sect2>