211–218 of 218 posts
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Apparently no engineers here anymore, all armchair politicians.
When the politicians take a hatchet to the underpinnings of society that we built, we have to get political.
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But pretty high on the list that NIST NTP is important for (since it leaves the building through the internet).
If NIST NTP goes down, the internet doesn’t go down. But atomic clocks drifting does upset many scientific experiments, which would effectively go down for the duration of the outage.
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These claims are bullshit. You can get technical details about the clock first-hand at this link: https://www.nist.gov/pml/time-and-frequency-division/time-re... and you can see a photo of the actual installation here: https://www.denver7.com/news/front-range/boulder/new-atomic-... As you can see, the room is clearly not filled with asbestos. Furthermore, the claim is absurd on its face. Asbestos was banned in the U.…
Agreed the stated claims don't seem to make much sense. Using a point mass 1 meter away and (G*M)/(r*c^2) I'm getting that you'd have to stand next to the clock for ~61 years to cause a time dilation due to gravity exceeding 10^-16 seconds.
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I'm the Manager of the Computing group at JILA at CU, where utcnist*.colorado.edu used to be housed. Those machines were, for years, consistently the highest bandwidth usage computers on campus. Unfortunately, the HP cesium clock that backed the utcnist systems failed a few weeks ago, so they're offline. I believe the plan is to decommission those servers anyway - NIST doesn't even list them on the NTP status page an…
I love these comments on HN. Now if the (otherwise very kind) guy in charge of the Bureau international des poids et mesures at Sèvres who did not let me have a look at the refrerence for the kilogram and meter could change his mind, I would appreciate. For a physicist this is kinda like a cathedral.
They have so many incredible artifacts (for weights and measures but also so much more: engineering, physics, civil engineering, machining,...)
Old sci-fi story of mine, maybe the only one ever inspired by NTP THE TIME RIFT OF 2100: How We lost the Future --- and Gained the Past. https://tech.slashdot.org/comments.pl?sid=7132077&cid=493082...
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I love these comments on HN. Now if the (otherwise very kind) guy in charge of the Bureau international des poids et mesures at Sèvres who did not let me have a look at the refrerence for the kilogram and meter could change his mind, I would appreciate. For a physicist this is kinda like a cathedral.
If you ever are in Paris, I can't recommend the Musee des Arts et Metiers enough. I believe they have the several reference platinum kilograms that are now out of spec. [1] they also have the original actual Foucault pendulum that was used to demonstrate Earth's rotation. (and a replica doing a live demo, of course) They have so many incredible artifacts (for weights and measures but also so much more: engineering, p…
The Musée de Sèvres (or Bureau des Mesures as it is called now) has the original kilogramme and meter iridium reference, hidden in the basement ;( So if the director has a change of heart, I am all in!
It’s fine. The public pays for sci-fi clocks used by NIST and the Navy and we get shit latency over NTP and a WWVB signal that barely reaches a huge chunk of the country. CLOCKS WE PAID FOR. Jane Street gets lightning access to clocks and our pension managers get their NTP trades front run. NTP is a disgrace and an insult when it is working.
The rest of the snark/ bitterness aside ... NTP takes latency as a constraint, and accommodates for it. And far from a disgrace, NTP was a brilliant design for its time, and has proven to be far more future-proof than should have been expected.
Future proof? Are you living in the same future I am where our trades are front run? I notice you didn’t engage with the substance of my attack at all.
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I love these comments on HN. Now if the (otherwise very kind) guy in charge of the Bureau international des poids et mesures at Sèvres who did not let me have a look at the refrerence for the kilogram and meter could change his mind, I would appreciate. For a physicist this is kinda like a cathedral.
If you ever are in Paris, I can't recommend the Musee des Arts et Metiers enough. I believe they have the several reference platinum kilograms that are now out of spec. [1] they also have the original actual Foucault pendulum that was used to demonstrate Earth's rotation. (and a replica doing a live demo, of course) They have so many incredible artifacts (for weights and measures but also so much more: engineering, p…
I spent 4 hours to there and was surprised to see so many tourists, this is not a place I expected people visiting Paris to go to. There were no crowds though.
The top part is really great, you get to see how much people did with so little. So is the chemistry part.
I found the steel replica of the kilogramme and the meter, and of course the Foucault pendulum (in the neighboring refurbished church).
This is truly an interesting museum, on part with the museum of discoveries (musée de la découverte) which is unfortunately close now for a few years for renovations (or at lest was recently planned to be closed). Much better than La Vilette.
So thank you again!