2 ms·
Relativistic effects are measurable with accurate enough clocks in earth satellites (or even just taking a clock to a mountain) and correction is necessary in s
by pvg 4y ago
Relativistic effects are measurable with accurate enough clocks in earth satellites (or even just taking a clock to a mountain) and correction is necessary in systems with finicky time requirements like GPS.
Incidentally, the relative speed you can napkin math estimate - an object in orbit flying that close to the planet is going to have escape-velocity-ish speed. It's around 60km/sec for Jupiter.
- dmd 4y ago> taking a clock to a mountain http://www.leapsecond.com/great2005/tour/ http://www.leapsecond.com/great2005/tour/
- belter 4y agoThey also did the First Atomic Clock Wristwatch... http://leapsecond.com/pages/atomic-bill/ http://leapsecond.com/pages/atomic-bill/
- cmroanirgo 4y agoFantastic! Has this been shared on HN before? > We would come back about 20 ns older compared to her [the wife who stayed behind]. ≥ Or, the other way to look at it (since this is relativity after all), is that she would become 20 ns younger than us upon our return. Note to husbands: this could be a useful gift idea for your wife.
- pvg 4y agoIt has, in the HN equivalent of the Archean eon https://news.ycombinator.com/item?id=598090 https://news.ycombinator.com/item?id=598090
- atoav 4y agoBy now I think they managed to measure relativistic effects of clocks that are a few milimeters apart in terms of distance from earths gravitational center.
- pvg 4y agoSufficiently clever experimentalists also pulled this off in about 20 meters in 1959, the clever bit being ditching the clocks entirely: https://en.wikipedia.org/wiki/Pound%E2%80%93Rebka_experiment https://en.wikipedia.org/wiki/Pound%E2%80%93Rebka_experiment