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43 lines
1.4 KiB
43 lines
1.4 KiB
<sect2 id="calc-equinox">
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<title>Equinoxes and Solstices module</title>
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<indexterm><primary>Tools</primary>
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<secondary>Astrocalculator</secondary>
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<tertiary>Equinoxes and Solstices module</tertiary>
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</indexterm>
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<screenshot>
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<screeninfo>
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The Equinoxes and Solstices calculator module
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</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="calc-equinox.png" format="PNG"/>
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</imageobject>
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<textobject>
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<phrase>Equinoxes and Solstices</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 <link linkend="ai-equinox">Equinoxes</link> and
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Solstices module calculates the date and time of an
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equinox or solstice for a given year. You specify which
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event (Spring Equinox, Summer Solstice, Autumn Equinox,
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or Winter Solstice) should be investigated, and the year.
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Then press the <guibutton>Compute</guibutton> button to
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obtain the date and time of the event, and the length of
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the corresponding season, in days.
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</para>
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<para>
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There is a batch mode for this module. To use it, simply
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generate an input file whose lines each contain a year
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for which the Equinox and Solstice data will be computed.
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Then specify the input and output filenames, and press the
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<guibutton>Run</guibutton> button to generate the output
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file. Each line in the output file contains the input year,
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the date and time of each event, and the length of each
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season.
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</para>
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</sect2>
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