[time-nuts] How did they distribute time in the old days?
tshoppa at gmail.com
Wed Oct 14 08:42:01 EDT 2015
As recently as 1987, there was poor to no absolute time synchronization at
the world's underground neutrino detectors. When light and neutrino fronts
from supernova SN1987A arrived, the best they were able to put absolute
timestamps on neutrino events was about 1 minute.
Even after the neutrino arrivals they may have been able to back-correct
timestamps on the Kamiokande data to within milliseconds, but a power
failure a few days after SN1987A detection prevented this.
The timescales that the Kamiokande and IMB neutrino detectors were
originally designed to measure? Circa 10 to the 31st years!
Today the realtime neutrino detectors are tied together into a network to
look for neutrino bursts in realtime, and even determine direction to point
optical telescopes. The neutrino burst for a SN1987A type event precedes
the optical detectability by a few hours.
On Wednesday, October 14, 2015, Hal Murray <hmurray at megapathdsl.net> wrote:
> holrum at hotmail.com said:
> > Somewhat time-nut related... the project main application needed
> > millisecond consistent (not necessarily accurate) time stamps on a
> > world-wide network. That was in the pre-gps, pre-fiber, pre-historic
> > before-times. I don't think that they ever quite got there.
> World wide seismology took off in the early 1970s as background for nuclear
> underground non-testing treaties. Both the US and the USSR had to be sure
> they could detect the opponents tests and distinguish tests from
> We had seismic stations scattered around the globe.
> Does anybody know how they distributed time back then and/or how accurately
> they could do it?
> Google says the speed of sound in rock is 6-8 km/s so 10 ms error would be
> 100 meters. That seems like a reasonable ballpark.
> These are my opinions. I hate spam.
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