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+<sect2 id="calc-horiz">
+<title>Horizontal Coordinates module</title>
+<indexterm><primary>Tools</primary>
+<secondary>Astrocalculator</secondary>
+<tertiary>Horizontal Coordinates module</tertiary>
+</indexterm>
+
+<screenshot>
+<screeninfo>
+The Horizontal Coordinates calculator module
+</screeninfo>
+<mediaobject>
+  <imageobject>
+    <imagedata fileref="calc-horizontal.png" format="PNG"/>
+  </imageobject>
+  <textobject>
+    <phrase>Horizontal Coordinates</phrase>
+  </textobject>
+</mediaobject>
+</screenshot>
+
+<para>
+This module converts from <link linkend="equatorial">Equatorial 
+coordinates</link> to <link linkend="horizontal">Horizontal 
+coordinates</link>.  First, select the date, time, and 
+geographic coordinates for the calculation in the 
+<guilabel>Input Data</guilabel> section.  Then, fill in the 
+equatorial coordinates to be converted and their catalog epoch 
+in the <guilabel>Equatorial Coordinates</guilabel> section.
+When you press the <guibutton>Compute</guibutton> button,
+the corresponding Horizontal coordinates will be presented in
+the <guilabel>Horizontal Coordinates</guilabel> section.
+</para>
+</sect2>
+