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diff --git a/doc/kstars/cequator.docbook b/doc/kstars/cequator.docbook new file mode 100644 index 00000000..31e730c5 --- /dev/null +++ b/doc/kstars/cequator.docbook @@ -0,0 +1,27 @@ +<sect1 id="ai-cequator"> +<sect1info> +<author> +<firstname>Jason</firstname> +<surname>Harris</surname> +</author> +</sect1info> +<title>The Celestial Equator</title> +<indexterm><primary>Celestial Equator</primary> +<seealso>Equatorial Coordinates</seealso> +</indexterm> +<para> +The <firstterm>Celestial Equator</firstterm> is an imaginary <link +linkend="ai-greatcircle">great circle</link> on the <link +linkend="ai-csphere">celestial sphere</link>. The celestial equator +is the fundamental plane of the <link linkend="equatorial">Equatorial +Coordinate System</link>, so it is defined as the locus of points +with Declination of zero degrees. It is also the projection of the +Earth's equator onto the sky. +</para> +<para> +The Celestial Equator and the <link linkend="ai-ecliptic">Ecliptic</link> +are set at an angle of 23.5 degrees in the sky. The points where they +intersect are the Vernal and Autumnal <link +linkend="ai-equinox">Equinoxes</link>. +</para> +</sect1> |