History of timekeeping

Time zones grew out of railway scheduling problems in the 1800s. North American railroads adopted standard zones in 1883, and an 1884 conference in Washington set Greenwich as the world's zero meridian.

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The 24-hour day comes from ancient Egyptian and Greek practice, while 60 minutes and seconds come from the Sumerian and Babylonian base-60 system, kept for its convenient divisibility.

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Starter thread · AI-reviewed against its sources