One of the key drivers of inventing methods of keeping track of time were the farmers needs to determine the best time to plant. Archaeologists have discovered bones with inscriptions that are believed to have been used to track lunar cycles.
The clock is one of the oldest human inventions, requiring a physical process that will proceed at a known rate and a way to gauge how long that process has run. As the seasons and the phases of the moon can be used to measure the passage of longer periods of time, shorter processes had to be used to measure off hours and minutes.
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