For anyone curious about atomic clocks, the time nuts mailing list is really interesting imo :) http://www.leapsecond.com/time-nuts.htm http://www.leapsecond.c

For anyone curious about atomic clocks, the time nuts mailing list is really interesting imo :) http://www.leapsecond.com/time-nuts.htm http://www.leapsecond.com/time-nuts.htm A while ago I tried to measure the phase difference between two of my Rubidium ones https://www.anfractuosity.com/projects/rubidium-clocks/ https://www.anfractuosity.com/projects/rubidium-clocks/ I would like to try that again at some point, if I can fix one of my clocks again, as I don't think I got the timebase setting right. As an aside the light from the rubidium bulb, glows a really nice purpleish colour :) I'm sure I read that there are now atomic clocks, which are so accurate, they 'tick' at different rates, depending on their height in a room. This is what I was thinking of: http://www.riken.jp/en/research/rikenresearch/highlights/8280/ http://www.riken.jp/en/research/rikenresearch/highlights/828... It seems it's an Optical Lattice Clock.