\documentclass[french]{article}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage[a4paper]{geometry}
\geometry{verbose,tmargin=1.4cm,bmargin=1.4cm,lmargin=1.2cm,rmargin=1.5cm,headheight=0cm,headsep=0.7cm,footskip=0cm}
\usepackage[frenchb]{babel} % gestion du francais
\usepackage{pstricks} % appel de Pstricks
\usepackage{pstricks-add} % complements de Pstricks
\begin{document}
\psscalebox{1}{%
\begin{pspicture}(-7,-7)(7,7)
%\psgrid
\SpecialCoor
\def\rayon{6}
\pnode(-\rayon,0){Ltrois}
\pnode(0,0){Soleil}
\pnode(\rayon,0){Terre}
\pnode(5,0){Lun}
\pnode(7,0){Ldeux}
\pnode(\rayon;60){Lquatre}
\pnode(\rayon;-60){Lcinq}
%%%%%%% axes principaux et cercle
\psline[linestyle=dashed]([nodesep=-1]Ltrois)([nodesep=0.5]Ldeux)
\psline[linestyle=dashed](0,-7)(0,7)
\pscircle(Soleil){\rayon}
%%%%% legendes
\rput([offset=0.4]Lun){$\mathrm{L}_{1}$}
\rput([offset=0.4]Ldeux){$\mathrm{L}_{2}$}
\rput([offset=0.4,nodesep=-0.3]Ltrois){$\mathrm{L}_{3}$}
\rput([offset=0.4,nodesep=0.3]Lquatre){$\mathrm{L}_{4}$}
\rput([offset=-0.4,nodesep=0.3]Lcinq){$\mathrm{L}_{5}$}
\rput([offset=0.75,nodesep=-0.8]Soleil){Soleil}
\rput([offset=0.75]Terre){Terre}
%%%%% derniere trace et angles
\psline[linestyle=dashed,linecolor=red](Soleil)(Lquatre)(Terre)(Lcinq)(Soleil)
\psarc(Soleil){1.3cm}{-60}{0} \rput(1.7cm;-30){60$^\circ$}
\psarc(Lcinq){1.3cm}{60}{120} \rput([offset=1.7cm]Lcinq){60$^\circ$}
\psarc(Terre){1.3cm}{180}{240} \rput([offset=-0.85cm,nodesep=-1.4cm]Terre){60$^\circ$}
%%%%%% trace des spheres Soleil, Terre et 3 points de Lagrange sur l'axe
\pscircle[fillstyle=solid,fillcolor=gray,linestyle=none](Lun){0.1}
\pscircle[fillstyle=solid,fillcolor=gray,linestyle=none](Ldeux){0.1}
\pscircle[fillstyle=solid,fillcolor=gray,linestyle=none](Ltrois){0.1}
\pscircle[fillstyle=solid,fillcolor=gray,linestyle=none](Lquatre){0.1}
\pscircle[fillstyle=solid,fillcolor=gray,linestyle=none](Lcinq){0.1}
\pscircle[fillstyle=solid,fillcolor=yellow,linestyle=none](Soleil){0.5}
\pscircle[fillstyle=solid,fillcolor=blue!60,linestyle=none](Terre){0.25}
\end{pspicture}
}
\end{document}