This is one application I have developed for WP7. It is a map of the night sky and at the same time a three dimensional map of the nearest stars. You can switch between a view from the Earth and a Space view of the nearest stars. A 3D view of the solar system is coming soon. This is a link to the Windows Phone Marketplace:

The website for the project is

A short introductory video can be found on YouTube at and also another one at

I use XNA as a platform for this project. It is quite mature framework for working with 3D world. The system uses device GPS when drawing the local horizon and stars visible from a viewers specific location.

I am waiting for Microsoft to release the Compass API so I can implement the point to sky feature and the app will scroll to the portion of the sky you are pointing to.

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