Four of these fragments contain gears, while inscriptions are found on many others. Medieval European science Indian astronomy Medieval Islamic astronomy. There is no coaxial system but only for the Moon. A fictionalised version of the device was a central plot point in the film Stonehenge Apocalypse , where it was used as the artefact that saved the world from impending doom. The mechanism was operated by turning a small hand crank now lost which was linked via a crown gear to the largest gear, the four-spoked gear visible on the front of fragment A, the gear named b1. No gearing for such a planetary display survives and all gears are accounted for—with the exception of one toothed gear r1 otherwise unaccounted for in fragment D.
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