Working Model of 2100 Year Old Astronomical Calculator
This is pretty neat. This museum curator build a replica of this calculator from 2100 years ago. It's pretty neat... it predicts moon phases, the positions of the planets, and eclipses and such. There's a video that does a good job of explaining and demonstrating the device.
http://www.networkworld.com/news/2008/1 ... ml?hpg1=bn