Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
I just thought if we all jumped up and down on Everest we could squash it down into the ground and speed the world back up again. In that way we could get it back in sync with real time, I mean atomic time. Or maybe use any of the spare NASA rocket boosters securely attached to the earth and ignited so they speed the world up a bit. BTW, there are lots of bicycles in China, maybe they could jump off of them instead of chairs. Steve On 15 July 2011 11:29, J. Forster j...@quik.com wrote: Why do you need them to jump at all? If you got all the Chinese to just stand on a chair, it would increase the Moment of Inertia of the earth a smitch, and it would slow the rotation because of the Conservation of Angular Momentum. -John === On 7/14/2011 2:02 PM, Steve Rooke wrote: Well, if everyonel climbed Everest and we all jumped up and down together, perhaps we could achieve that :) Cheers, Steve I can't resist moving this off-topic thread by a giant leap. I have a 1969 R. Crumb comic book starring Fritz the Cat. In one story, Fritz discovers the Chinese have a rocket program. The rocket is powered by the vast population blowing into tubes. I didn't think this was practical but it did occur to me that they could have a workable WMD (although the term wasn't yet popular) if they got all the Chinese to climb up on a chair and jump down at exactly the same time (give or take a few milliseconds). Back in 1969 this wasn't workable because there was no way to get everyone jumping in sync. We all know that devices that could coordinate this event are becoming common and pretty cheap. You could reduce the required number of accurate clocks by gathering the jumpers into large venues like auditoriums or sporting arenas. Or just broadcast a count down from local radio stations with good clocks. Seems most of us are making our recent purchases of accurate timing devices from sellers in China. Is that just a coincidence? ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On Fri, Jul 15, 2011 at 13:54, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 3209.12.6.201.213.1310686158.squir...@popaccts.quikus.com, J. For ster writes: If you got all the Chinese to just stand on a chair, it would increase the Moment of Inertia of the earth a smitch, and it would slow the rotation because of the Conservation of Angular Momentum. 1. It's not obvious that there are that many chairs in China. 2. It really does not change the momentum that much: m(pop,china) = 1.5e9 * 50kg = 7.5e10 kg m(earth) = 5.97e24 kg A ratio of roughly 8e13... Spoilsport! If you are going to do the actual calculations, that rather destroys my daydreaming! -- Sanjeev Gupta +65 98551208 http://www.linkedin.com/in/ghane -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
p...@phk.freebsd.dk said: 2. It really does not change the momentum that much: m(pop,china) = 1.5e9 * 50kg = 7.5e10 kg m(earth) = 5.97e24 kg A ratio of roughly 8e13... Neat. Thanks. I think you missed another big factor. The height of a chair is tiny relative to the radius of the Earth. Lets call a chair 1 meter. The radius of the Earth is 6,3xx km or 6E6 meters. So that makes a ratio of more than 1E20. 1E14 we might be able to notice. 1E20 will be lost in the noise. Does anybody have a good graph for summer vs winter? I'd expect snow loading might be big enough to show up. PS: You need to round down the earth's moment of inertia by 2/5 because it's a uniform density sphere rather than the mass being concentrated at the radius on the equator. (mass next to the axis doesn't help) I'm assuming all the people in China are on the equator. There is a cos latitude fudge factor to correct for that. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
1E14 we might be able to notice Hal, No. Look at the adev of the earth (earlier posting). The length of earth day varies in the *milli*second range, day to day. VLBI measurements are under 0.1 millisecond, which comes to about 1e-9 resolution. Realize that none of the NASA earthquake may have shortened press releases are about real measurements of rotation. They are just impressive models of changes in momentum. The predictions are in the *micro*second range. The press does not always distinguish between milli and micro. /tvb ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
t...@leapsecond.com said: No. Look at the adev of the earth (earlier posting). The length of earth day varies in the *milli*second range, day to day. VLBI measurements are under 0.1 millisecond, which comes to about 1e-9 resolution. Realize that none of the NASA earthquake may have shortened press releases are about real measurements of rotation. They are just impressive models of changes in momentum. The predictions are in the *micro*second range. The press does not always distinguish between milli and micro. Ouch. Thanks for the correction/heads-up. [Here is the graph: http://www.leapsecond.com/museum/earth/1sigma1.gif and background http://www.leapsecond.com/museum/earth/ ] Do you have any guesses on the short term stability? (where short means left of your graph) Suppose all those Chinese people hopped up and down on their chair in synchrony. What would be the ideal timing? I think I'm fishing for something like a chopper amplifier, but I'm not sure how I would explain a chopper to somebody who didn't know about them. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 7/14/11 10:54 PM, Poul-Henning Kamp wrote: In message3209.12.6.201.213.1310686158.squir...@popaccts.quikus.com, J. For ster writes: If you got all the Chinese to just stand on a chair, it would increase the Moment of Inertia of the earth a smitch, and it would slow the rotation because of the Conservation of Angular Momentum. 1. It's not obvious that there are that many chairs in China. 2. It really does not change the momentum that much: m(pop,china) = 1.5e9 * 50kg = 7.5e10 kg m(earth) = 5.97e24 kg A ratio of roughly 8e13... At first I thought, hey, we measure ADEV variations of that sort of the level. But then, I remembered that not only is the mass small, but the radius change is small. maybe a meter out of almost 7 million. So now we're at an effect of one part in, say, 1E19. I think to do this kind of thing on a detectable scale with manmade cause, we'll need to resort to some serious terraforming (bwahaha.. project plowshare, here I come) ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 7/15/11 12:10 AM, Hal Murray wrote: Does anybody have a good graph for summer vs winter? I'd expect snow loading might be big enough to show up. This is the kind of thing that Richard Gross at JPL fools with. As I recall, atmospheric drag changes on a cyclical basis too. And solid/liquid tides Among other sources, data comes from all those geodetic GPS receiving stations feeding into gipsy ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 7/15/11 12:48 AM, Tom Van Baak (lab/iPad) wrote: 1E14 we might be able to notice Hal, No. Look at the adev of the earth (earlier posting). The length of earth day varies in the *milli*second range, day to day. VLBI measurements are under 0.1 millisecond, which comes to about 1e-9 resolution. Realize that none of the NASA earthquake may have shortened press releases are about real measurements of rotation. They are just impressive models of changes in momentum. The predictions are in the *micro*second range. The press does not always distinguish between milli and micro. And, there's a somewhat non-noise-free-channel from the guys doing the calculations to the public affairs officer to the media. This kind of thing is actually sort of interesting in a planetary sense. While earth is pretty stable, there are places where there are a lot more earthquakes and internal tidal forces (Jupiter's moons) and changes in rotation rate of the moons might be detectable by radar. Is Io gradually slowing? There's also coupling to Jupiter, of course (e.g. our Moon having a rotation rate synced to orbital period) What about Mercury? ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
In message 4e203b6e.8090...@earthlink.net, Jim Lux writes: On 7/14/11 10:54 PM, Poul-Henning Kamp wrote: I think to do this kind of thing on a detectable scale with manmade cause, we'll need to resort to some serious terraforming (bwahaha.. project plowshare, here I come) You could probably reduce the gap by approx 1e3 by starting a rumour in China that there is free porn and roads paved with gold in the Himalayas :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
Given the monosex culture the Chinese population has set itself upon, just spread a rumor that there are abundant single women in the Himalayas that are looking for dates. -Chuck Harris Poul-Henning Kamp wrote: In message4e203b6e.8090...@earthlink.net, Jim Lux writes: On 7/14/11 10:54 PM, Poul-Henning Kamp wrote: I think to do this kind of thing on a detectable scale with manmade cause, we'll need to resort to some serious terraforming (bwahaha.. project plowshare, here I come) You could probably reduce the gap by approx 1e3 by starting a rumour in China that there is free porn and roads paved with gold in the Himalayas :-) ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John === Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.html Will ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
Maybe we will end up taking away leap-seconds soon. Just a random thought given the amount of seismic activity currently going on in the world. Steve (Quakecity, New Zealand) On 15 July 2011 01:40, J. Forster j...@quik.com wrote: So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John === Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.html Will ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
However, atomic time and earth time effectively drift apart, and that is why periodically we have leap seconds to bring the two closer together again. So we still need the astronomical measurements. Think of it as atomic time being the linear reference, and earth time a course saw tooth, which periodically comes into sync with the addition (or subtraction) of leap seconds. Rob K -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: 14 July 2011 2:41 PM To: xfor...@citynet.net; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John === Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.htm l Will ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 15 July 2011 02:08, Rob Kimberley r...@timing-consultants.com wrote: However, atomic time and earth time effectively drift apart, and that is why periodically we have leap seconds to bring the two closer together again. So we still need the astronomical measurements. Think of it as atomic time being the linear reference, and earth time a course saw tooth, which periodically comes into sync with the addition (or subtraction) of leap seconds. Thanks, I was aware of this but my comment was that instead of the usual need to add leap seconds, we perhaps may have a need to subtract in the future should the world speed up significantly compared to it's decaying rotation. The thought here is that event would be an interesting test for the GPS disciplined clocks around the world. Steve Rob K -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: 14 July 2011 2:41 PM To: xfor...@citynet.net; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John === Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.htm l Will ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
Sorry, my reply was sent before your comment about speed up. Yes, in theory, if the earth were to speed up sufficiently we would need to subtract leap seconds. The old spinning top is unfortunately slowing down (with minor wobbles and variations such as the recent earthquake in Japan). Minor in terms of the effect on the earth, but of course not minor to those affected. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Steve Rooke Sent: 14 July 2011 3:27 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis On 15 July 2011 02:08, Rob Kimberley r...@timing-consultants.com wrote: However, atomic time and earth time effectively drift apart, and that is why periodically we have leap seconds to bring the two closer together again. So we still need the astronomical measurements. Think of it as atomic time being the linear reference, and earth time a course saw tooth, which periodically comes into sync with the addition (or subtraction) of leap seconds. Thanks, I was aware of this but my comment was that instead of the usual need to add leap seconds, we perhaps may have a need to subtract in the future should the world speed up significantly compared to it's decaying rotation. The thought here is that event would be an interesting test for the GPS disciplined clocks around the world. Steve Rob K -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: 14 July 2011 2:41 PM To: xfor...@citynet.net; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John === Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.ht m l Will ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 7/14/11 6:40 AM, J. Forster wrote: So? That statement clearly imlies the Earth's period was shortened aganst some standard. If the Earth was the standard, how could it be shortened with respect to itself? It can't be. Time standards are atomic now. -John You've raised an interesting philosophical issue. And worthy of time-nuts, striking at the core of what is time.. And, as it happens, Richard's office is next to a friend of mine at work, so I will bring it up. Perhaps we can strive for more precision (or is it accuracy?) in the press release. (rigor of terminology, anyway) I like this comment: may actually be large enough to observe if scientists can adequately remove the larger effects of the atmosphere and ocean from the Earth rotation measurements. From what I've heard.. the difficulty of adequately remove is pretty large. Basically, they assume the earth is stable and whatever happens is the result of those effects.. that is, they use it to measure the effects. Measuring day length or axis direction is more of a average over many many years kind of proposition. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
So what is the Allan deviation of the earth spinning? :) ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
In message 29c8a27967ae5343be5ad7a887c9bd1a188db17...@esi-sbs08.esi.lan, Davi d VanHorn writes: So what is the Allan deviation of the earth spinning? :) I calculated allan/mod-allan on the Bulletin A data some years back, it's not exactly pretty. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
So what is the Allan deviation of the earth spinning? :) http://www.leapsecond.com/museum/earth/ /tvb ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
Anyone got a big file so we can cut those Himalayas down, I'm sure they are creating a lot of drag :) Steve On 15 July 2011 04:01, Tom Van Baak (lab/iPad) t...@leapsecond.com wrote: So what is the Allan deviation of the earth spinning? :) http://www.leapsecond.com/museum/earth/ /tvb ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
tvb... Bravo! Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van Baak (lab/iPad) Sent: Thursday, July 14, 2011 12:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis So what is the Allan deviation of the earth spinning? :) http://www.leapsecond.com/museum/earth/ /tvb ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
COOL! From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] On Behalf Of Tom Holmes [thol...@woh.rr.com] Sent: Thursday, July 14, 2011 10:17 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis tvb... Bravo! Tom Holmes, N8ZM Tipp City, OH EM79 -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van Baak (lab/iPad) Sent: Thursday, July 14, 2011 12:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis So what is the Allan deviation of the earth spinning? :) http://www.leapsecond.com/museum/earth/ /tvb ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 14/07/11 18:12, Steve Rooke wrote: Anyone got a big file so we can cut those Himalayas down, I'm sure they are creating a lot of drag :) Take your Dremel and a few spare bits and cut it loose. :) Moving that mass closer into the core would cause some spin-up. Still, the other effects would be horrible. Cheers, Magnus ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 15 July 2011 07:38, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 14/07/11 18:12, Steve Rooke wrote: Anyone got a big file so we can cut those Himalayas down, I'm sure they are creating a lot of drag :) Take your Dremel and a few spare bits and cut it loose. :) Moving that mass closer into the core would cause some spin-up. Still, the other effects would be horrible. Well, if everyonel climbed Everest and we all jumped up and down together, perhaps we could achieve that :) Cheers, Steve Cheers, Magnus ___ 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. -- Steve Rooke - ZL3TUV G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
On 7/14/2011 2:02 PM, Steve Rooke wrote: Well, if everyonel climbed Everest and we all jumped up and down together, perhaps we could achieve that :) Cheers, Steve I can't resist moving this off-topic thread by a giant leap. I have a 1969 R. Crumb comic book starring Fritz the Cat. In one story, Fritz discovers the Chinese have a rocket program. The rocket is powered by the vast population blowing into tubes. I didn't think this was practical but it did occur to me that they could have a workable WMD (although the term wasn't yet popular) if they got all the Chinese to climb up on a chair and jump down at exactly the same time (give or take a few milliseconds). Back in 1969 this wasn't workable because there was no way to get everyone jumping in sync. We all know that devices that could coordinate this event are becoming common and pretty cheap. You could reduce the required number of accurate clocks by gathering the jumpers into large venues like auditoriums or sporting arenas. Or just broadcast a count down from local radio stations with good clocks. Seems most of us are making our recent purchases of accurate timing devices from sellers in China. Is that just a coincidence? ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
Why do you need them to jump at all? If you got all the Chinese to just stand on a chair, it would increase the Moment of Inertia of the earth a smitch, and it would slow the rotation because of the Conservation of Angular Momentum. -John === On 7/14/2011 2:02 PM, Steve Rooke wrote: Well, if everyonel climbed Everest and we all jumped up and down together, perhaps we could achieve that :) Cheers, Steve I can't resist moving this off-topic thread by a giant leap. I have a 1969 R. Crumb comic book starring Fritz the Cat. In one story, Fritz discovers the Chinese have a rocket program. The rocket is powered by the vast population blowing into tubes. I didn't think this was practical but it did occur to me that they could have a workable WMD (although the term wasn't yet popular) if they got all the Chinese to climb up on a chair and jump down at exactly the same time (give or take a few milliseconds). Back in 1969 this wasn't workable because there was no way to get everyone jumping in sync. We all know that devices that could coordinate this event are becoming common and pretty cheap. You could reduce the required number of accurate clocks by gathering the jumpers into large venues like auditoriums or sporting arenas. Or just broadcast a count down from local radio stations with good clocks. Seems most of us are making our recent purchases of accurate timing devices from sellers in China. Is that just a coincidence? ___ 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.
Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis
In message 3209.12.6.201.213.1310686158.squir...@popaccts.quikus.com, J. For ster writes: If you got all the Chinese to just stand on a chair, it would increase the Moment of Inertia of the earth a smitch, and it would slow the rotation because of the Conservation of Angular Momentum. 1. It's not obvious that there are that many chairs in China. 2. It really does not change the momentum that much: m(pop,china) = 1.5e9 * 50kg = 7.5e10 kg m(earth) = 5.97e24 kg A ratio of roughly 8e13... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Japan Quake May Have Shortened Earth Days, Moved Axis
Calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds. http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.html Will ___ 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.
