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diff --git a/doc/kstars/meridian.docbook b/doc/kstars/meridian.docbook new file mode 100644 index 00000000..e6859127 --- /dev/null +++ b/doc/kstars/meridian.docbook @@ -0,0 +1,28 @@ +<sect1 id="ai-meridian"> +<sect1info> +<author> +<firstname>Jason</firstname> +<surname>Harris</surname> +</author> +</sect1info> +<title>The Local Meridian</title> +<indexterm><primary>Local Meridian</primary> +<seealso>Hour Angle</seealso> +<seealso>Celestial Sphere</seealso> +</indexterm> +<para> +The Local Meridian is an imaginary <link linkend="ai-greatcircle">Great Circle</link> +on the <link linkend="ai-csphere">Celestial Sphere</link> that is perpendicular +to the local <link linkend="ai-horizon">Horizon</link>. It passes through the +North point on the Horizon, through the <link linkend="ai-cpoles">Celestial +Pole</link>, up to the <link linkend="ai-zenith">Zenith</link>, and through the +South point on the Horizon. +</para><para> +Because it is fixed to the local Horizon, stars will appear to drift past +the Local Meridian as the Earth spins. You can use an object's <link +linkend="equatorial">Right Ascension</link> and the <link +linkend="ai-sidereal">Local Sidereal Time</link> to determine when it will +cross your Local Meridian (see <link linkend="ai-hourangle">Hour Angle</link>). +</para> +</sect1> + |