Babylonian astronomers systematize the sky
Late Babylonian scribes kept centuries of systematic records of celestial positions and developed mathematical schemes to predict lunar and planetary phenomena.
Humanity
115 events across three thousand years — chosen to be multi-regional and honest about uncertainty. Follow a thread to trace one capability through time, or filter by region and kind.
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Euclid's Elements
Euclid organized Greek geometry into axioms, definitions and proven theorems — one of the most reprinted books in history.
Al-Khwarizmi writes al-jabr
Al-Khwarizmi systematized solving equations in The Compendious Book on Calculation by Completion and Balancing, and popularized Hindu-Arabic numerals.
Chronology
Babylonian astronomers systematize the sky
Late Babylonian scribes kept centuries of systematic records of celestial positions and developed mathematical schemes to predict lunar and planetary phenomena.
Euclid's Elements
Euclid organized Greek geometry into axioms, definitions and proven theorems — one of the most reprinted books in history.
Al-Khwarizmi writes al-jabr
Al-Khwarizmi systematized solving equations in The Compendious Book on Calculation by Completion and Balancing, and popularized Hindu-Arabic numerals.