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+<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>
+