There are lots of clever apps out there that will allow you to point your GPS-enabled smartphone towards the sky and see a detailed map of what celestial bodies are where.
None however, that I can find, offers the functionality included in today’s invention.
Instead of doing the standard thing of compressing stars into meaningless, 2-D constellations, the app which I envisage would portray the stars as dots with different diameters.
Closer stars would have a larger diameter.
This would also allow stars at a common radius to be shown on a translucent sphere (perhaps with different colours for each).
It would then be easy to animate the simulated movement in a given direction from sphere to sphere (and thus backwards in time).
Here is a recent review of some such apps http://www.nytimes.com/2013/02/28/technology/personaltech/stargazing-apps-for-amateur-astronomers.html?nl=todaysheadlines&emc=edit_th_20130228&_r=0