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diff --git a/doc/kstars/greatcircle.docbook b/doc/kstars/greatcircle.docbook new file mode 100644 index 00000000..109fba45 --- /dev/null +++ b/doc/kstars/greatcircle.docbook @@ -0,0 +1,27 @@ +<sect1 id="ai-greatcircle"> +<sect1info> +<author> +<firstname>Jason</firstname> +<surname>Harris</surname> +</author> +</sect1info> +<title>Great Circles</title> +<indexterm><primary>Great Circles</primary> +<seealso>Celestial Sphere</seealso> +</indexterm> +<para> +Consider a sphere, such as the Earth, or the +<link linkend="ai-csphere">Celestial Sphere</link>. The intersection +of any plane with the sphere will result in a circle on the surface of +the sphere. If the plane happens to contain the center of the sphere, +the intersection circle is a <firstterm>Great Circle</firstterm>. +Great circles are the largest circles that can be drawn on a sphere. +Also, the shortest path between any two points on a sphere is always +along a great circle. +</para><para> +Some examples of great circles on the celestial sphere include: the +<link linkend="ai-horizon">Horizon</link>, the +<link linkend="ai-cequator">Celestial Equator</link>, and the +<link linkend="ai-ecliptic">Ecliptic</link>. +</para> +</sect1> |