Based on statistical analysis of micro CT imaging of the more than 2,000-year-old Antikythera Mechanism, we show unexpected evidence establishing a lunar calendar with Egyptian civil-calendar month-names circa 100 B.C. This finding displaces a century-long presumption of a 365-day solar calendar on the Antikythera Mechanism with a 354-day lunar calendar and may inform a fundamental question of the number and type of calendars used in Ancient Egypt.
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