The sun dial worked during daylight, but how did people agree on what time it was at night before clocks were invented?

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There were so many problems with monitoring time. Even today I always dread it a bit. While we’ve tried to at least move the issues from the mechanistic to the philosophical, we still run into things like the Y2K and the 2038 problems. Hell, I remember running into an issue with calculating leap years and such as an undergrad.

I like to think that, if nothing else, it gives me a greater appreciation for Discworld.

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