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38 lines
1.1 KiB
38 lines
1.1 KiB
<sect2 id="calc-precess">
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<title>Precession module</title>
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<indexterm><primary>Tools</primary>
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<secondary>Astrocalculator</secondary>
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<tertiary>Precession module</tertiary>
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</indexterm>
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<screenshot>
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<screeninfo>
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The Precession calculator module
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</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="calc-precess.png" format="PNG"/>
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</imageobject>
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<textobject>
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<phrase>Precession</phrase>
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</textobject>
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</mediaobject>
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</screenshot>
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<para>
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This module is similar to the <link linkend="calc-apcoords">Apparent
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Coordinates module</link>, but it only applies the effect of
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<link linkend="ai-precession">precession</link>, not of nutation or
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aberration.
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</para>
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<para>
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To use the module, first enter the input coordinates and their epoch
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in the <guilabel>Original Coordinates</guilabel> section. You must
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also fill in the target epoch in the <guilabel>Precessed
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Coordinates</guilabel> section. Then, press the
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<guibutton>Compute</guibutton> button, and the object's
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coordinates, precessed to the target Epoch, are presented in the
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<guilabel>Precessed Coordinates</guilabel> section.
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</para>
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</sect2>
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