<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>