On: Teams in Vienna and Beijing have built the first thorium nuclear clocks

[froh]

TIL an atomic clock is not a nuclear clock.

the former brings (cesium) atoms, including their electrons, into resonance.

the latter brings (thorium) _nuclei_ into resonance.

both then "just like any clock" measure that oscillation. "simples" ;-)

and I learned "environment" creating drift is temperature, magnetism, anything that influences electrons.

[rdtsc → froh]

"atomic" and "nuclear" have been used interchangeably at various times. In the past almost everything was "atomic". But more recently and more formally atomic deals with nucleus and it's electron shells, and nuclear deals just with the nucleus.