Mr. Harald Bardenhagen is founder of the "Astronomy Workshop" in Köln Germany.
In mid-2009, He made my decision to give the topic of astronomy a new emphasis in his life. He is currently a freelance lecturer and will be active as an independent entrepreneur from the middle of 2013 around the topic of astronomy and light pollution around.

Now he is using Shira Player on his astronomy workshop.

www.sterne-ohne-grenzen.de