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+<sect2 id="calc-dayduration">
+<title>Day Duration module</title>
+<indexterm><primary>Tools</primary>
+<secondary>Astrocalculator</secondary>
+<tertiary>Day Duration module</tertiary>
+</indexterm>
+
+<screenshot>
+<screeninfo>
+The Day Duration calculator module
+</screeninfo>
+<mediaobject>
+  <imageobject>
+    <imagedata fileref="calc-daylength.png" format="PNG"/>
+  </imageobject>
+  <textobject>
+    <phrase>Day Duration</phrase>
+  </textobject>
+</mediaobject>
+</screenshot>
+
+<para>
+This module computes the length of day as well as sunrise, sun-transit 
+(noon), and sunset times for any calendar date, for any location on 
+Earth.  First fill in the desired geographic coordinates and date, then
+press the <guibutton>Compute</guibutton> button.  
+</para>
+</sect2>