Ancient Moon 'computer' revisited
The delicate workings at the heart of a 2,000-year-old analogue computer have been revealed by scientists.
Eclipse function
Using bespoke non-invasive imaging systems, such as three-dimensional X-ray microfocus computed tomography, the team was able to take detailed pictures of the device and uncover new information.
The major structure they describe, like earlier studies, had a single, centrally placed dial on the front plate that showed the Greek zodiac and an Egyptian calendar on concentric scales.
On the back, two further dials displayed information about the timing of lunar cycles and eclipse patterns. Previously, the idea that the mechanism could predict eclipses had only been a hypothesis.
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http://news.bbc.co.uk/1/hi/sci/tech/6191462.stm