Kepler, by Walter W. Bryant. "I'm sure you remember that Tycho Brahe had his own system of the universe. In a tychonic system, the earth was stationary at the center, the sun went around the earth, and all of the other planets went around the sun.
You can download the installer of Kepler 1.0 for free and read users' reviews on Droid Informer. The app runs on Android 2.1 and higher. This application is completely secure for downloading. Leco Droid is the developer of the tool which can be found in the Books & Reference category.