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diff --git a/doc/kstars/zenith.docbook b/doc/kstars/zenith.docbook new file mode 100644 index 00000000..f0d80ea2 --- /dev/null +++ b/doc/kstars/zenith.docbook @@ -0,0 +1,31 @@ +<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 center 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>Pointing</guimenu> menu. +</para> +</tip> +</sect1> |