system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did human civilisation come to a consensus on how long a second is?
gpt
It originated with the ancient Sumerians, who had a sexagesimal system of mathematics (a numeral system with sixty as its base). The Babylonians adopted the Sumerian method, which later was adopted by the Greeks, and then adopted by the Romans. Thereafter the practice spread throughout Western Europe and eventually the world, via the Roman Empire and later, via European colonization and trade.