Sky Map was designed and developed by a group of Google engineers in Pittsburgh, Pennsylvania as part of their 20% time.3
It's now "donated and open-sourced".
On January 20, 2012, Google announced a student development partnership with Carnegie Mellon University and released Sky Map under the Apache 2.0 open source license.4
The project is presently available in the form of a GitHub repository.5
Temperton, James (2011-11-22). "Google Sky Map for Android helps you explore the universe". Computeractive. Incisive Media. Archived from the original on 2012-03-19. Retrieved 2013-10-23. https://web.archive.org/web/20120319150124/http://www.computeractive.co.uk/ca/download-review/2126796/google-sky-map-android-helps-explore-universe ↩
Baig, Edward C. (2010-11-17). "Google Sky Map Android app travels through time". USA Today. ABC News. Archived from the original on 2011-02-17. Retrieved 2013-10-23. https://web.archive.org/web/20110217100101/https://abcnews.go.com/Technology/google-sky-map-android-app-travels-time/story?id=12177867 ↩
Walker-Morgan, Dj (2012-01-23). "Google's Sky Map for Android now open source". The H. Archived from the original on 2013-12-06. Retrieved 2013-10-23. https://web.archive.org/web/20131206201504/http://www.h-online.com/open/news/item/Google-s-Sky-Map-for-Android-now-open-source-1419779.html ↩
Taylor, John; Serafini, Kevin (2012-01-20). "Open-sourcing Sky Map and collaborating with Carnegie Mellon University". Research @ Google. Retrieved 2013-10-23. http://googleresearch.blogspot.com/2012/01/open-sourcing-sky-map-and-collaborating.html ↩
"stardroid". GitHub. Retrieved 2016-03-08. https://github.com/sky-map-team/stardroid/ ↩