Supplementary information : Decoding the ancient Greek astronomical calculator known as the Antikythera Mechanism : Nature

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Decoding the ancient Greek astronomical calculator known as the Antikythera Mechanism

T. Freeth, Y. Bitsakis, X. Moussas, J. H. Seiradakis, A. Tselikas, H. Mangou, M. Zafeiropoulou, R. Hadland, D. Bate, A. Ramsey, M. Allen, A. Crawley, P. Hockley, T. Malzbender, D. Gelb, W. Ambrisco and M. G. Edmunds

Nature 444, 587-591(30 November 2006)

doi:10.1038/nature05357

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Supplementary notes

This file contains supplementary notes giving a key to fragment identification for Figure 1 of the main text and the dimensions of the fragments; further notes giving details of the script of the characters, their dating and the Greek text and its provisional translation from the Front Door inscriptions, the Back Door inscriptions and the Back Plate inscriptions near the Lower Back Dial. Also further notes giving a table to compare gear nomenclature and the gear tooth count estimates with previous estimates and to tabulate measured radii. Some notes are given on the individual gears and on the tooth count estimation procedure, including the effects of uncertainty in determining the centres of the gears. The gear train ratios are explained on the basis of simple Babylonian period relations. The equivalence of the epicyclic gearing and pin-and-slot mechanism to Hipparchos' theory of the moon is proved.

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