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+<sect1 id="ai-horizon">
+<sect1info>
+<author
+><firstname
+>Jason</firstname
+> <surname
+>Harris</surname
+> </author>
+</sect1info>
+<title
+>The Horizon</title>
+<indexterm
+><primary
+>Horizon</primary>
+<seealso
+>Horizontal Coordinates</seealso>
+</indexterm>
+<para
+>The <firstterm
+>Horizon</firstterm
+> is the line that separates Earth from Sky. More precisely, it is the line that divides all of the directions you can possibly look into two categories: those which intersect the Earth, and those which do not. At many locations, the Horizon is obscured by trees, buildings, mountains &etc;. However, if you are on a ship at sea, the Horizon is strikingly apparent. </para
+><para
+>The horizon is the <firstterm
+>Fundamental Plane</firstterm
+> of the <link linkend="horizontal"
+>Horizontal Coordinate System</link
+>. In other words, it is the locus of points which have an <firstterm
+>Altitude</firstterm
+> of zero degrees. </para>
+</sect1>