[time-nuts] Re: Odd Request: WTB Lathe.

Hi, Perhaps my post was misleading. The pendulum quality isn't particularly tied to the machine accuracy. AFIK, the material selection and heat treatment (and many other things) are much more important than dimensional accuracy for a pendulum itself. Any pendulum should have adjustments to co

[time-nuts] Why we can't calculate atomic energy levels and how we do it anyways

Moin, A few years ago, in a discussion on atomic clocks, someone asked why we have to measure energy levels of atoms and their related frequencies instead of calculating the exact value and use that instead. I just found a decent video that explains the problem in simple terms and how we get arou