Circadian clock live wallpaper

Version of the free nummolt's Circadian Clock, as a Live Wallpaper.
This time, the buttons of the original app, are in the preferences checkboxes of the installer.

What is the Circadian Clock? 
Here: http://nummolt.blogspot.com.es/2014/03/posted-new-circadian-clock-at-google.html

Buy this app to support the development work of educational software that makes nummolt.com