The Classical WorldScience & Math Metonic cycle 432 BCENotable Meton of Athens notes that 19 solar years almost exactly equal 235 lunar months. The cycle was used to align lunar and solar calendars. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → Habitual fire and cooking → Homo sapiens appears → Complex language → Natufian villages → Oldest known bread → Agriculture begins → Irrigation → Uruk and the first cities → Cylinder seals → Writing (cuneiform) → Babylonian mathematics → Babylonian astronomical diaries → Metonic cycle Community notesLoading notes… Learn more ranked by votesBookJames EvansThe History and Practice of Ancient Astronomy ↗Editor's pickVideoSearch on YouTubeMetonic cycle explained ↗Editor's pick