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44 lines
1.3 KiB
44 lines
1.3 KiB
15 years ago
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<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>
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The Angular Distance calculator module
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</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>
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The Angular Distance tool is used to measure the angle between any
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two points on the sky. You simply specify the
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<link linkend="equatorial">Equatorial coordinates</link> of the
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desired pair of points, and then press the
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<guibutton>Compute</guibutton> button to obtain the angle between
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the two points.
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</para>
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<para>
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There is also a Batch mode for this module. In batch mode, you
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specify an input filename which contains four numbers per line:
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the RA and Dec values for pairs of points. Alternatively, you can
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specify a single value for any of these four coordinates in
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the calculator panel (the corresponding values in the input file
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should be skipped if they are specified in the calculator).
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</para>
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<para>
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Once you have specified the input filename and an output filename,
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simply press the <guibutton>Run</guibutton> button to generate the
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output file.
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</para>
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</sect2>
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