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+<sect1 id="ai-zenith">
+<sect1info>
+<author
+><firstname
+>Jason</firstname
+> <surname
+>Harris</surname
+> </author>
+</sect1info>
+<title
+>The Zenith</title>
+<indexterm
+><primary
+>Zenith</primary>
+<seealso
+>Horizontal Coordinates</seealso>
+</indexterm>
+<para
+>The Zenith is the point in the sky where you are looking when you look <quote
+>straight up</quote
+> from the ground. More precisely, it is the point on the sky with an <firstterm
+>Altitude</firstterm
+> of +90 Degrees; it is the Pole of the <link linkend="horizontal"
+>Horizontal Coordinate System</link
+>. Geometrically, it is the point on the <link linkend="ai-csphere"
+>Celestial Sphere</link
+> intersected by a line drawn from the centre of the Earth through your location on the Earth's surface. </para
+><para
+>The Zenith is, by definition, a point along the <link linkend="ai-meridian"
+>Local Meridian</link
+>. </para>
+<tip>
+<para
+>Exercise:</para>
+<para
+>You can point to the Zenith by pressing <keycap
+>Z</keycap
+> or by selecting <guimenuitem
+>Zenith</guimenuitem
+> from the <guimenu
+>Location</guimenu
+> menu. </para>
+</tip>
+</sect1>