The Draconic Gearing of the Antikythera Mechanism: Assembling the Fragment D, Its Role and Operation
The Draconic gearing of the Antikythera Mechanism: Assembling the Fragment D, its role and operation A.Voulgaris1, C.Mouratidis2, A.Vossinakis3, G.Bokovos4 (Submitted 14 January 2020) 1Municipality of Thessaloniki, Directorate Culture and Tourism, Thessaloniki, GR-54625, Greece 2Hellenic Ministry of Education, Research and Religious Affairs, Kos, GR-85300, Greece 3Thessaloniki Astronomy Club, Thessaloniki, GR-54646, Greece 4Thessaloniki Science Center and Technology Museum-Planetarium, Thermi, GR-57001, Greece Abstract The unplaced Fragment D of the Antikythera Mechanism with an unknown operation was a mystery since the beginning of its discovery. The gear-r1, which was detected on the Fragment radiographies by C. Karakalos, is preserved in excellent condition, but this was not enough to correlate it to the existing gear trainings of the Mechanism. The suggestion that this gear could be a part of the hypothetical planet indication gearing is still a hypothesis since no mechanical evidence has been preserved. After the analysis of AMRP tomographies of Fragment D and its mechanical characteristics revealed that it could be part of the Draconic gearing. Although the Draconic cycle was well known during the Mechanism’s era as represents the fourth Lunar cycle, it seems that it is missing from the Antikythera Mechanism. The study of Fragment D was supported by the bronze reconstruction of the Draconic gearing by the authors. The adaptation of the Draconic gearing on the Antikythera Mechanism improves its functionality and gives answers on several questions. 1. Introduction. The Antikythera Mechanism, a geared machine based on the lunar cycles The Antikythera Mechanism a creation of an ingenious manufacturer of the Hellenistic era was a geared machine capable of performing complex astronomical calculations, mostly based on the lunar periodic cycles.
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