From Raedwulf:

Well, for people without digital watches, I reckon about... 3 days to be sure?

Maybe it would take that long even for people with digital watches, after all, once they're programed, machines will go on ticking and counting off mechanical time regardless of what the sun does -- or what the earth does in relation to the sun (but the Earth, Sun and Moon are really three aspects of one life system, so quibbling over whether the sun rises or the Earth rotates really rather misses the whole point). And it's what the Sun does that matters, so it's better to trust your senses directly, IMNSHO.

Joys and peace and prosperity to you all!