Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdeedu@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

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+<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>