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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>
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