this post was submitted on 26 Feb 2024
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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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[–] [email protected] 4 points 9 months ago* (last edited 9 months ago) (1 children)

They're post is almost completely backwards. Early alarm clocks were nails put into the side of predictably burning candles, that would fall out when it burned down to a certain point, which would happen at a predictable time.

Additionally, while you could probably tell the time from the moon, that would require it actually being up that night/time and then understanding a lot of complicated things about it's motion around us to have any sort of accuracy. I bet only a few astronomers have even been able to do this. Also it would be 100% reproducible because it's not like the moon makes random movements, it's perfectly predictable.

[–] [email protected] 2 points 9 months ago (1 children)

Would it be that complicated if people knew the lunar cycle, especially since the lunar cycle is fairly static? Not everyone I'm sure but those that needed a better time would probably understand and pass that knowledge along for the night folk. Of course depends when in technology we're talking but I'd assume we humans understood those cycles pretty early for our survival, not in depth but they got the idea the lunar cycle didn't change like the seasons did and adjust as needed. I haven't read up on it so I'll be glad to hear more info.

[–] Adalast 2 points 8 months ago

The issue with using the lunar cycle for timekeeping at night is that the moon is not always visible in the sky at night. It is also not at the same spot in the sky every night, so the math on describing the time based on moon position is actually pretty complex, and unreliable for a consistent overnight clock. You might think that tides could be used as well, but it that is even more complex. In fact, some of the first analog computers were created to do the calculus required to solve the question of timing and tides.