HistoryAncient (c. 2nd-1st century BCE)Greecehigh confidence

The Antikythera Mechanism functioned as a computer that tracked dates according to multiple calendars, lunar movements, upcoming solar and lunar eclipses, and events such as the Olympics.

Notes on verification

Confirmed by peer-reviewed research (Nature, Freeth et al.), the Antikythera Mechanism Research Project, and reputable science journalism, all consistent in describing its functions. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=2 claim_tier=notable]

Sources