Der_Missionar t1_ixerhdp wrote
Reply to comment by DrugChemistry 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
Yes, quartz crystals which have a very specific resonant frequency which can then be used to keep time.
Viewing a single comment thread. View all comments