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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>