Figure showing a parking orbit, from NASA report SP-4210.
original : NASA - SVG Version : <a href="//commons.wikimedia.org/wiki/User:Flappiefh" title="User:Flappiefh">Flappiefh</a>
2012-03-05
<a rel="nofollow" class="external text" href="http://history.nasa.gov/SP-4210/images/jpeg/fig_51.jpg">From NASA website</a>