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This joke just clicked for me
(lemmy.world)
Description
This is a community for sharing those cheesy “dad” jokes that invoke an eye roll or chuckle.
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What would the hourglass look like?
https://en.wikipedia.org/wiki/Water_clock
Not even remotely old enough.
The sun.
Most likely. Bit boring though.
A sundial
World's oldest known sundial is 1500 BC
Well in its basic form it's a literal stick in the ground, you aren't gonna get anything more ancient than that.
if you can't read the hours you could just look at the sky.
I guess, but sun on its own doesn't really fit the definition of a tool
candle burning down? with nails or something in it that fall out into a metal plate to PING the time