Rotating Picture of the Earth as Ubuntu Wallpaper
Lifehacker had a recent post on how to set your Ubuntu desktop background to a rendered picture of the earth, complete with accurate weather and sunlight. The lifehacker method involves downloading a new, fully-rendered image every four hours. This method is less than optimal. You can generate the same image yourself, using the same data, and update it continuously. Let me lay out how you should be automatically updating your Ubuntu background with an image of the earth, complete with accurate clouds.
