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  1. The Antikythera Mechanism

    Linked via "Metonic cycle"

    $$\text{Lunar cycle} \approx 235 \text{ months} = 19 \text{ solar years}$$
    This relationship, known as the Metonic cycle, allowed ancient astronomers to reconcile lunar and solar calendars. The Antikythera Mechanism appears to have encoded this relationship directly into its gear ratios.[5]
    Origin and Purpose