Since this is not my area of expertise, I searched Google under the key words "Hans Zacharias Janssen" to get these possible sources:
http://en.wikipedia.org/wiki/Zacharias_Janssen
(Broken Link Removed)
http://www.amazines.com/Hans_Janssen_related.html
http://www.amazines.com/Hans_Janssen_related.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
What year was Hans and Zacharias Janssen born?
1 answer