<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>