Google has opened up Sky Map: announcement and source code.
Just built it with Eclipse. To build, download the source via svn. Then:
1. Import trunk/app as an existing-source Android 2.3.3 project.
2. In the Project Properties, go to Java Build Path and Libraries.
2.1. Press "Add JARs..." and select libGoogleAnalytics.jar from trunk/app/libs/libGoogleAnalytics.jar
2.2. Press "Add External JARs..." and select the two jars from trunk/tools/libs