<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 catalogue 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>