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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
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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>