Just wanted to share a wrapper library I wrote for a recent project that visualizes the positions of passing satellites over a given location on earth. The library offers added functionality to the bare tracking (NORAD) algorithms and formats data so it can be used with the processing logic... a couple of examples are added and some vague Javadocs are provided.

http://github.com/Protonumerique/Satelistica

and the site for the project with examples of applications:

http://satelistica.com

The actual source might be a bit confusing and perhaps there are spelling mistakes and so on, but the library works pretty well.

Cheers and have fun if you think you can use this for something