folli parent
I'll start: I'm still actively working on my Android app, Sun Locator, that helps photographers and outdoorsy people to predict the position of the sun and the shadows caused by mountains and hills. It helped me to learn quite a lot about Android programming, the app ecosphere and costumer support, and it makes a bit of spending money on the side.
More info: http://www.sunlocator.com
Great job! I'd love to hear more about the calculations involved for the sun and moon paths and the implementation of the shadow maps. If you have the time and haven't already perhaps it would be worthy of a blog?