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� 6��fc @ s� d Z d d l m Z m Z m Z m Z d d l m Z d Z d e f d � � YZ d e f d � � YZ d � Z e d k r� e � Z e GHe � n d S( s� turtle-example-suite: tdemo_planets_and_moon.py Gravitational system simulation using the approximation method from Feynman-lectures, p.9-8, using turtlegraphics. Example: heavy central body, light planet, very light moon! Planet has a circular orbit, moon a stable orbit around the planet. You can hold the movement temporarily by pressing the left mouse button with mouse over the scrollbar of the canvas. i����( t Shapet Turtlet mainloopt Vec2D( t sleepi t GravSysc B s# e Z d � Z d � Z d � Z RS( c C s g | _ d | _ d | _ d S( Ni g{�G�z�?( t planetst tt dt( t self( ( s9 /usr/lib64/python2.7/Demo/turtle/tdemo_planet_and_moon.pyt __init__ s c C s"