Much more accurate optical lattice clocks definitely are affected by gravity - scientists have determined hight by measuring the difference between clocks at di

Much more accurate optical lattice clocks definitely are affected by gravity - scientists have determined hight by measuring the difference between clocks at different elevations, linked by optical fibre [1], and that article also makes reference to atomic clocks that have been transported by plane having been observed to have recorded slightly different amounts of elapsed time than ones that stayed on the ground (as is expected). I assume it is affected to some extent by the gravitational force of the moon and the sun, but I expect that would be harder to measure. 1. https://www.sciencedaily.com/releases/2013/10/131002103036.htm https://www.sciencedaily.com/releases/2013/10/131002103036.h...