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24 lines
1.3 KiB
24 lines
1.3 KiB
<sect2 id="calc-angdist">
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<title>Angular Distance module</title>
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<indexterm><primary>Tools</primary>
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<secondary>Astrocalculator</secondary>
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<tertiary>Angular Distance module</tertiary>
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</indexterm>
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<screenshot>
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<screeninfo>The Angular Distance calculator module </screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="calc-angdist.png" format="PNG"/>
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</imageobject>
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<textobject>
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<phrase>Angular Distance</phrase>
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</textobject>
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</mediaobject>
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</screenshot>
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<para>The Angular Distance tool is used to measure the angle between any two points on the sky. You simply specify the <link linkend="equatorial">Equatorial coordinates</link> of the desired pair of points, and then press the <guibutton>Compute</guibutton> button to obtain the angle between the two points. </para>
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<para>There is also a Batch mode for this module. In batch mode, you specify an input filename which contains four numbers per line: the RA and Dec values for pairs of points. Alternatively, you can specify a single value for any of these four coordinates in the calculator panel (the corresponding values in the input file should be skipped if they are specified in the calculator). </para>
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<para>Once you have specified the input filename and an output filename, simply press the <guibutton>Run</guibutton> button to generate the output file. </para>
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</sect2>
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