Major leap for nuclear clock paves way for ultraprecise timekeeping

Post by rcxdude » Fri, Dec 13, 2024, 10:40 PM UTC

fsh wrote: post #10

rcxdude wrote: post #8

Earlier quoted context omitted.

> when moving the earth one meter closer or further from your clock. You standing next to it is going to have absolutely no effect. Maybe GR messes this up, but at least with newtonian gravity the difference is not as stark as this comparison would imply: a 1m change in elevation is about 300ugal, while an 80kg person 1m away is about .5ugal, so still not going to show up on a 1e-18 clock, but it's pretty close.

The gravitational redshift is proportional to the gravitational potential (~1/distance), not to the gravitational acceleration (~1/distance²). This suppresses the effect of small masses nearby a lot compared to the effect of the earth.