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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
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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>
+