Warning, /education/kstars/doc/meridian.docbook is written in an unsupported language. File is not indexed.

 <sect1 id="ai-meridian">
 <sect1info>
 <author>
 <firstname>Jason</firstname>
 <surname>Harris</surname>
 </author>
 </sect1info>
 <title>The Local Meridian</title>
 <indexterm><primary>Local Meridian</primary>
 <seealso>Hour Angle</seealso>
 <seealso>Celestial Sphere</seealso>
 </indexterm>
 <para>
 The Local Meridian is an imaginary <link linkend="ai-greatcircle">Great Circle</link>
 on the <link linkend="ai-csphere">Celestial Sphere</link> that is perpendicular
 to the local <link linkend="ai-horizon">Horizon</link>.  It passes through the
 North point on the Horizon, through the <link linkend="ai-cpoles">Celestial
 Pole</link>, up to the <link linkend="ai-zenith">Zenith</link>, and through the
 South point on the Horizon.
 </para><para>
 Because it is fixed to the local Horizon, stars will appear to drift past
 the Local Meridian as the Earth spins.  You can use an object's <link
 linkend="equatorial">Right Ascension</link> and the <link
 linkend="ai-sidereal">Local Sidereal Time</link> to determine when it will
 cross your Local Meridian (see <link linkend="ai-hourangle">Hour Angle</link>).
 </para>
 </sect1>