I was reading about the Long Now clock, which is a clock designed to run for 10,000 years without human intervention. It got me thinking about why such a clock might be an important artifact in a post-apocalyptic world.
So my question for all of you is: why would knowing the time according to the creators of the clock (presumably accurate) be important to people after the apocalypse?
I'm thinking of it being long enough after the apocalypse that there are relatively stable communities, as in Fallout: New Vegas, but not so long that things like bandits are not a problem. The tech level is flexible, but preferably there are no computers, or they are very rare. The cause of the apocalypse is also flexible.
To clarify, I'm not asking about why Long Now is doing it. Their reasons are listed on their website, so no guesswork needed. I'm wondering what conditions would make such a clock important to people after the apocalypse.