The Research

More than a hundred years ago an extraordinary mechanism was found by sponge divers at the bottom of the sea near the island of Antikythera. It astonished the whole international community of experts on the ancient world. Was it an astrolabe? Was it an orrery or an astronomical clock? Or something else?

Fragment A of the Antikythera Mechanism reconstructed through 3D Computed Tomography.
Copyright of the Antikythera Mechanism Research Project.

The Antikythera Mechanism Research Project

The Antikythera Mechanism Research Project is an international collaboration of academic researchers, supported by some of the world's best high-technology companies, which aims to completely reassess the function and significance of the Antikythera Mechanism. For details, please read:

Computed Tomography Slices of Fragment A of the Antikythera Mechanism.
Copyright of the Antikythera Mechanism Research Project.


In an exciting link up between high-tech industry and international universities, including Cardiff, Athens and Thessaloniki, the secrets of a two-thousand-year-old astronomical calculating device, the Antikythera Mechanism, are exposed for the first time with a unique 400kV microfocus Computed Tomography System.

Although the Mechanism is no bigger than a shoe box, it is too priceless and unique to leave the National Archaeological Museum in Athens, so a major expedition in late 2005 brought an X-ray tomography machine, weighing over 7.5 tonnes, to examine the artefact in Greece.

The Inspection

X-Tek’s 400kV microfocus CT equipment has been used to probe the secrets of the ancient artefact, estimated to date from around 80 BC. Discovered in 1900 AD in a shipwreck in the Greek islands, the Antikythera Mechanism contains over 30 gear wheels and dials and the remains are covered in astronomical inscriptions. It may be a device to demonstrate the motion of the Sun, Moon and planets, or to calculate calendars or astrological events.

However the great surprise has been the ability of the CT results to show hidden inscriptions in many of the Fragments. In the case of Fragment G this is exemplary: Price (1974) notes that its inscription is “almost illegible’, reading only 180 characters. The CT images, viewed at various angles, enabled the research project to read 932 characters.

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