Interesting, but I don't really follow how flooding would be any more helpful than the seasons in general.

The answer is the same as my bank is demanding from me.

Deposits. Regular, periodic deposits.

I still don't get it. Why would that help you keep a calendar when you already have the seasons?

We can today verify certain dates by looking at the deposit records.

Sorry, but here is what I was responding to:

>"the consistency of Nile River flooding meant their calendars are likely the most accurate"

You seem to be talking about something different now.

Because of the flooding the harvest was very consistent every year. And taxes and purchases were therefore very consistent. This provides a set of records based on the solar calendar, not subject to the whims of changing rulers.

This seems pretty dubious to me. In fact I'd think they would have less need for a good calendar since the proposed extremely regular harvests would happen regardless.

It's not about the calendar itself so much as the purchase and tax records that corroborate that with timelines and other evidence.

It lets us correlate their calendars with our own.

Sorry, but here is what I was responding to:

>"the consistency of Nile River flooding meant their calendars are likely the most accurate"

You seem to be talking about something different.