4 ms·
This is a great way to compare ultra-precise clocks! Also, I'm looking forward to Einsteinian altimeters everywhere.
by FredPret 1y ago
This is a great way to compare ultra-precise clocks! Also, I'm looking forward to Einsteinian altimeters everywhere.
- jl6 1y agoI fear this altimeter idea may be scuppered by local variations in the Earth’s density (it’s not an exactly uniform sphere of rock). Or maybe that just means the clocks could be great density-mappers!
- bravoetch 1y agoAre you saying they would be relatively inaccurate?
- ianburrell 1y agoIt is easier to measure density with gravimeter than measure gravitational force directly. Satellite, ACES, was launched recently that uses atomic clocks to accurately measure Earth's gravity field.
- FredPret 1y agoI had the same thought, but I still want one! On second thought, you need a base station on the ground to tell you its time for comparison anyway, so if that base station is nearby the density thing should mostly work itself out