# How to draw big circle (intersection of a plane with a sphere)?

I use Geospacw to draw two big circles but I cannot it using TikZ (or PSTricks).

How can I draw it?

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You should at least give it a try; this is not a "do it for me" forum. –  Svend Tveskæg Feb 23 '14 at 3:58
@ Svend I want to try but I can not. –  minthao_2011 Feb 23 '14 at 6:14

Just for typing exercise with PSTricks.

\documentclass[pstricks]{standalone}
\usepackage{pst-eucl}
\newcommand\Orbit[2][0]{\rput{#1}{%
\psellipse[linewidth=0,linestyle=none,fillstyle=vlines,hatchcolor=#2!20,hatchsep=2pt](0,0)(4,1)%
\psellipticarc[linecolor=#2!50](0,0)(4,1){180}{360}}}

\begin{document}
\pspicture[dimen=m](-5,-5)(5,5)
\Orbit{red}\Orbit[300]{green}\pscircle[linecolor=blue]{4}
\pstGeonode{A}
\endpspicture
\end{document}


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Note: hatchstyle=dashed does not exist. –  kiss my armpit Feb 23 '14 at 4:17

With tikz. May need some polishing but, I put it as such.

\documentclass[tikz]{standalone}
\usetikzlibrary{patterns}
\newcommand{\greatcircle}[5][]{%
\begin{scope}[rotate=#5]
\clip (#3,0) rectangle ([xshift=-0.1,yshift=-0.1]-#3,-#4);
\end{scope}
}

\begin{document}
\begin{tikzpicture}

@rpapa not the rotation but simply change the y radius. –  Harish Kumar Feb 24 '14 at 22:24