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0001 <sect1 id="ai-horizon"> 0002 <sect1info> 0003 <author> 0004 <firstname>Jason</firstname> 0005 <surname>Harris</surname> 0006 </author> 0007 </sect1info> 0008 <title>The Horizon</title> 0009 <indexterm><primary>Horizon</primary> 0010 <seealso>Horizontal Coordinates</seealso> 0011 </indexterm> 0012 <para> 0013 The <firstterm>Horizon</firstterm> is the line that separates Earth from Sky. 0014 More precisely, it is the line that divides all of the directions you can 0015 possibly look into two categories: those which intersect the Earth, 0016 and those which do not. At many locations, the Horizon is 0017 obscured by trees, buildings, mountains, &etc; However, if you are on 0018 a ship at sea, the Horizon is strikingly apparent. 0019 </para><para> 0020 The horizon is the <firstterm>Fundamental Plane</firstterm> of the <link 0021 linkend="horizontal">Horizontal Coordinate System</link>. In other 0022 words, it is the locus of points which have an <firstterm>Altitude</firstterm> 0023 of zero degrees. 0024 </para> 0025 </sect1>