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Most of you probably remember reading about a wonderful astronomical clockwork mechanism found in a sunken ship dating back to 200 BC ------- not our BC :-)
Here is a link to a more detailed explanation of how it worked and how it might have looked. If you go to the bottom of the web page you will find a video of a reproduction made from Lego parts. It shows the inner workings in nice detail. It also discusses the gearing necessary to follow the 19 year eclipse cycle.
http://www.universetoday.com/95733/the-antikythera-time-machine/
Bob at PC
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