kstars/doc/calc-equinox.docbook

0001 <sect2 id="calc-equinox">
0002 <title>Equinoxes and Solstices module</title>
0003 <indexterm><primary>Tools</primary>
0004 <secondary>Astrocalculator</secondary>
0005 <tertiary>Equinoxes and Solstices module</tertiary>
0006 </indexterm>
0007
0008 <screenshot>
0009 <screeninfo>
0010 The Equinoxes and Solstices calculator module
0011 </screeninfo>
0012 <mediaobject>
0013   <imageobject>
0014     <imagedata fileref="calc-equinox.png" format="PNG"/>
0015   </imageobject>
0016   <textobject>
0017     <phrase>Equinoxes and Solstices</phrase>
0018   </textobject>
0019 </mediaobject>
0020 </screenshot>
0021
0022 <para>
0023 The <link linkend="ai-equinox">Equinoxes</link> and
0024 Solstices module calculates the date and time of an
0025 equinox or solstice for a given year.  You specify the year
0026 and the date and time of the events (Vernal Equinox,
0027 Summer Solstice, Autumnal Equinox, or Winter Solstice) are displayed.
0028 </para>
0029 <para>
0030 There is a batch mode for this module.  To use it, simply
0031 generate an input file whose lines each contain a year
0032 for which the Equinox and Solstice data will be computed.
0033 Then specify the input and output filenames, and press the
0034 <guibutton>Compute</guibutton> button to generate the output
0035 file.  Each line in the output file contains the input year and
0036 the date of each event. You can also read the output directly in &kstars;
0037 by pressing the <guibutton>View output...</guibutton> button.
0038 </para>
0039 </sect2>