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0001 <sect1 id="ai-zenith"> 0002 <sect1info> 0003 <author> 0004 <firstname>Jason</firstname> 0005 <surname>Harris</surname> 0006 </author> 0007 </sect1info> 0008 <title>The Zenith</title> 0009 <indexterm><primary>Zenith</primary> 0010 <seealso>Horizontal Coordinates</seealso> 0011 </indexterm> 0012 <para> 0013 The Zenith is the point in the sky where you are looking when you look 0014 <quote>straight up</quote> from the ground. More precisely, it is the point on 0015 the sky with an <firstterm>Altitude</firstterm> of +90 Degrees; it is the Pole 0016 of the <link linkend="horizontal">Horizontal Coordinate 0017 System</link>. Geometrically, it is the point on the <link 0018 linkend="ai-csphere">Celestial Sphere</link> intersected by a line drawn from 0019 the center of the Earth through your location on the Earth's surface. 0020 </para><para> 0021 The Zenith is, by definition, a point along the <link 0022 linkend="ai-meridian">Local Meridian</link>. 0023 </para> 0024 <tip> 0025 <para>Exercise:</para> 0026 <para> 0027 You can point to the Zenith by pressing <keycap>Z</keycap> or by selecting the 0028 <menuchoice><guimenu>Pointing</guimenu> <guimenuitem>Zenith</guimenuitem></menuchoice> menu item. 0029 </para> 0030 </tip> 0031 </sect1>