DrugChemistry t1_ixcqlgh wrote
Reply to comment by Der_Missionar in TIL the Passemant astronomical clock in Versailles has shown the correct date, time, moon phase, planetary alignment, etc (accounting for leap years ) from 1750 and can display through 9999. by kitkatbloo
Why does it lack crystals? My understanding is that the jewels in a clock/watch movement are placed in places where things spin. The jewels lower the friction between pieces and are hard so they don’t need frequent replacement.
iamPendergast t1_ixcszt1 wrote
I think they mean quartz i.e. digital clocks
DrugChemistry t1_ixctr9a wrote
Ohhhhhh
Der_Missionar t1_ixerhdp wrote
Yes, quartz crystals which have a very specific resonant frequency which can then be used to keep time.
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