system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How did someone originally assign value to the different variables of time?
gpt
Do you mean units of time?

Like seconds?

Well, days, years and lunar months are pretty easy to observe.

Now, 12 is a great number its better than ten. You can only divide 10 by 10, 5, 2, 1 but you can divide 12 by 12, 6, 4, 3, 2, 1. As multiples of 12, 60 & 24 are also useful numbers.

So a day was divided into 24 hours and then hours into 60 minutes and minutes into 60 seconds.