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+<sect2 id="calc-julian">
+<title
+>Julian Day module</title>
+<indexterm
+><primary
+>Tools</primary>
+<secondary
+>Astrocalculator</secondary>
+<tertiary
+>Julian Day module</tertiary>
+</indexterm>
+
+<screenshot>
+<screeninfo
+>The Julian Day calculator module </screeninfo>
+<mediaobject>
+  <imageobject>
+    <imagedata fileref="calc-julian.png" format="PNG"/>
+  </imageobject>
+  <textobject>
+    <phrase
+>Julian Day</phrase>
+  </textobject>
+</mediaobject>
+</screenshot>
+
+<para
+>This module converts between the calendar date, the <link linkend="ai-julianday"
+>Julian Day</link
+> and the <firstterm
+>Modified Julian Day</firstterm
+>. The Modified Julian Day is simply equal to the Julian Day - 2,400,000.5. </para
+><para
+>To use the module, select which of the three dates will be the input, and then fill in its value. Then press the <guibutton
+>Compute</guibutton
+> button, and the corresponding values for the other two date systems will be displayed. </para>
+
+<tip>
+<para
+>Exercise:</para>
+<para
+>What calendar date does MJD = 0.0 correspond to? </para>
+</tip>
+
+</sect2>