The world oldest calculating machine was discovered in 1900,
deep within a 2300 year old Greek wooden ship wreck, in the Mediteranean sea.

The corroded Bronze lump was carefully freed of its Calcium coating, and was surprisingly found to be a lump of gear wheels.

Its taken 20 over years to tease the object free into its 82 separate parts. For the last three years it has been subjected to 3D-Xray and Laser light which has shown up all the indexed markings stamped into its gear wheels.
It has been proven to be a sophisticated astronomical calculator, of the Moon and other Planetary motions, as well a
other more down to earth events.
Who could have made it is unknown, but it must have been a terrible loss for its owners those 2000+ years ago.

A modern working model is now being made. Amazing, those Ancients knew a thing or two.