Why Strontium over Caesium? Is it because it just sounds more hi-tech ? LOL
Maybe stupid question to most here, but I do not know the answer. -GKH On 11/03/2014 12:59 PM, Chris Albertson wrote: > On Mon, Nov 3, 2014 at 8:17 AM, xaos <x...@darksmile.net> wrote: > >> Small correction: The numbers were 10E-16. >> > No I think it was "one part in 10E16" ;) But the interesting thing was > they used numbers rather then saying something like "really super ultra > tiny". > > But you are right, no two clocks will ever agree at that level because they > will experience different gravitational fields. At this level the reason > to have a clock is no longer to tell time. It is to measure the > gravitational field. With an array of many clocks like these we might be > able to map the density of the interior of the earth or detect black holes > or who knows what. I think it opens up a new area of observation. When > ever this happens we discover things we never would have thought of. Maybe > in 40 years these Strontium oscillators will be mass produced for $2 each. > > Does anyone know how much "g" changes per cm of altitude? I'm to lazy to > figure it out. > > > >> One important concept that was discussed was this: >> If the next generation clock was even more accurate >> (maybe by an order or two), then no two clocks >> can ever agree on the time. >> >> Minute changes in gravity and other factors will >> always make each clock completely different. >> >> So, to that I said: WOW! Wait just a damn minute. >> I got into this so I can tell time precisely. Now I'm back >> to to the beginning. >> >> I know I am exaggerating a bit here but still. >> >> -GKH >> >> On 11/03/2014 11:09 AM, Chris Albertson wrote: >>> Yes, A story about time and frequency standards. They actually used >>> numbers like 10E16 in the story. Apparently at that level your clock can >>> measure a change in elevation of a few centimeters because of the >>> relativistic effects of the reduced gravity field in just a few cm. >>> >>> On Mon, Nov 3, 2014 at 6:28 AM, xaos <x...@darksmile.net> wrote: >>> >>>> This morning, as I was driving to work, >>>> I heard this really cool story on NPR radio here in NYC. >>>> >>>> This is the link to the story: >>>> >>>> >>>> >> http://www.npr.org/2014/11/03/361069820/what-time-is-it-it-depends-where-you-are-in-the-universe >>>> What a nice way to start the week. >>>> >>>> Past stories with similar headlines. >>>> >>>> >>>> >> http://www.npr.org/2014/01/24/265247930/tickety-tock-an-even-more-accurate-atomic-clock >>>> Cheers, >>>> >>>> George Hrysanthopoulos, N2FGX >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.