Times and Seasons

I love Autumn! It’s my favorite season of the year, even though sweeping up all the fallen leaves is a lot of work.

And the four seasons have existed as long as our planet has.

But, what about all the other kinds of time?

Years are natural, as are seasons, months, and days. Morning, noon, and night have always happened on Earth.

But seconds, minutes, hours, weeks, decades, and centuries are human inventions. Well, not exactly inventions, but they only exist because we decided they do.

I know the ancient Romans had calendars that included weeks, months and years, but when did people start calculating those things? Did people in Asia and Native Americans do that? 

I’d love to know how and when those concepts first developed.