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This work analyzes the phase correlation of the three lunar cycles and theSaros/Exeligmos cycle, after the study of the chapter About Exeligmos inIntroduction to the Phenomena by Geminus. Geminus, refers that each Exeligmoscycle began on very specific and rare dates, when the Moon positioned at thepoints of the three lunar cycles beginning: New moon at Apogee and at the Node.The extremely large duration of the Annular Solar eclipse occurred on December22 178BC (Saros series 58), marks the start of the Prominent Saros CycleApokatastasis. The next day, 23 December 178BC, the Winter Solstice started.During these two neighboring dates, the celebration of the religious festivalof Isia started in Egypt and the Hellenistic Greece. After the analysis of theMechanism's Parapegma events specific position, 22/23 December 178BC is anideal, functional and representative initial date, in order to calibrate theinitial position of the Mechanism's pointers.

The Initial Calibration Date of the Antikythera Mechanism after the Saros spiral mechanical Apokatastasis