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0001 <sect1 id="ai-meridian">
0002 <sect1info>
0003 <author>
0004 <firstname>Jason</firstname>
0005 <surname>Harris</surname>
0006 </author>
0007 </sect1info>
0008 <title>The Local Meridian</title>
0009 <indexterm><primary>Local Meridian</primary>
0010 <seealso>Hour Angle</seealso>
0011 <seealso>Celestial Sphere</seealso>
0012 </indexterm>
0013 <para>
0014 The Local Meridian is an imaginary <link linkend="ai-greatcircle">Great Circle</link>
0015 on the <link linkend="ai-csphere">Celestial Sphere</link> that is perpendicular
0016 to the local <link linkend="ai-horizon">Horizon</link>.  It passes through the
0017 North point on the Horizon, through the <link linkend="ai-cpoles">Celestial
0018 Pole</link>, up to the <link linkend="ai-zenith">Zenith</link>, and through the
0019 South point on the Horizon.
0020 </para><para>
0021 Because it is fixed to the local Horizon, stars will appear to drift past
0022 the Local Meridian as the Earth spins.  You can use an object's <link
0023 linkend="equatorial">Right Ascension</link> and the <link
0024 linkend="ai-sidereal">Local Sidereal Time</link> to determine when it will
0025 cross your Local Meridian (see <link linkend="ai-hourangle">Hour Angle</link>).
0026 </para>
0027 </sect1>