... Latest changes: Monday June 6, 2011 - added a display of the time scale used (i.e. the amount of time one screen represents) and noted that the z and Z keys can be used to change this value. ... Credits: The animation as built with Processing , the extraction and analysis code is available via my BitBucket site , and the background image is used with permission of @johnamatson . ... This browser does not have a Java Plug-in. ... Source code: aas218_anim ; Tweet ; histogram . ...