When humans first used clear time divisions of day

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SUMMARY

Humans first utilized clear time divisions of day and night with evidence dating back to the Cro-Magnon era, around 25,000 years ago, where bones were found with notches interpreted as counting days between lunar phases. The Babylonians, around 2500 BCE, are noted for counting daytime hours, indicating an early distinction between day and night. The transition to counting both days and nights separately occurred between these two periods, marking a significant development in timekeeping practices.

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wolram
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can anyone tell me when humans first used clear time divisions of day, night,
I do not mean terms like sun up or sun down, i mean artifical divisions.
 
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wolram said:
can anyone tell me when humans first used clear time divisions of day, night,
I do not mean terms like sun up or sun down, i mean artifical divisions.

Well there are bones from the Cro-Magnon era ( circa -25,000) carved with notches that have been interpreted as counting days between full (or maybe new) moons. So "days" but not "days and nights".

At the other end we have the Babylonians around -2500 who counted daytime hours but not nightime ones, implying they made the distinction.

Somewhere in between people decided to count days and nights separately.
 
selfAdjoint said:
Well there are bones from the Cro-Magnon era ( circa -25,000) carved with notches that have been interpreted as counting days between full (or maybe new) moons. So "days" but not "days and nights".

At the other end we have the Babylonians around -2500 who counted daytime hours but not nightime ones, implying they made the distinction.

Somewhere in between people decided to count days and nights separately.


Yes, i did read about the cro-magon bones some time ago, that idea seems a little tongue in cheek though.
 

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