I have recently taken a lot of interest in the lunar cycle and celestial events. I created this animated Mac background as a free download for the SquidMelon wallpaper app. This is a digital copy of a print poster that will be complete later this week.
Live Wallpaper App:
https://itunes.apple.com/us/app/live-wallpaper/id531123879?mt=12
Free Background:
http://goo.gl/znBnyx
(please note, background image is not my work)