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