Question #1: We All Lose Track of Time

Oops. Everyone, in the entire world, forgot what time it was. Maybe we all forgot the change the batteries for 500 years.

Today's question is:

How do you figure out the exact time, down to the millisecond, without referencing a running clock?

This question courtesy of ems

Feel free to send answers to me by email. I'll add interesting answers to the post.

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