[time-nuts] UTC and the speed of light?

2011-08-30 Thread Chris Albertson
How is the speed of light accounted for in the definition of UTC? In other words, how did they solve the conflict where on one hand we'd all expect two perfect clocks to tick at the same time but wether they do depends on the location of the observer? -- Chris Albertson Redondo Beach,

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Rob Kimberley
AFIK it isn't. Rob K -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: 30 August 2011 8:40 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] UTC and the speed of light? How

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread mike cook
-nuts] UTC and the speed of light? How is the speed of light accounted for in the definition of UTC? In other words, how did they solve the conflict where on one hand we'd all expect two perfect clocks to tick at the same time but wether they do depends on the location of the observer

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Rob Kimberley
cook Sent: 30 August 2011 9:52 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] UTC and the speed of light? Le 30/08/2011 10:36, Rob Kimberley a écrit : AFIK it isn't. Rob K -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread mike cook
Le 30/08/2011 11:21, Rob Kimberley a écrit : The original question asked whether the speed of light was taken into account in the definition of UTC. From where I'm standing (and please excuse the pun), it isn't. Rob Kimberley There were 2 questions. I was agreeing to your response to the first

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Rob Kimberley
-nuts] UTC and the speed of light? Le 30/08/2011 11:21, Rob Kimberley a écrit : The original question asked whether the speed of light was taken into account in the definition of UTC. From where I'm standing (and please excuse the pun), it isn't. Rob Kimberley There were 2 questions. I

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread mike cook
Le 30/08/2011 09:40, Chris Albertson a écrit : How is the speed of light accounted for in the definition of UTC? In other words, how did they solve the conflict where on one hand we'd all expect two perfect clocks to tick at the same time but wether they do depends on the location of the

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Jim Lux
On 8/30/11 12:40 AM, Chris Albertson wrote: How is the speed of light accounted for in the definition of UTC? 00:00:00 UTC is the same time everywhere. propagation only affects it if you are transmitting a signal based on UTC. If I send a signal at 00:00:00 UTC from LA to Greenwich,

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Tom Van Baak
How is the speed of light accounted for in the definition of UTC? In other words, how did they solve the conflict where on one hand we'd all expect two perfect clocks to tick at the same time but wether they do depends on the location of the observer? -- Chris Albertson Redondo Beach,

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Bill Hawkins
The question has both a frequency and a counter part, as does any clock. The frequency shift with gravity has been nicely addressed by tvb and others. The counter of the frequency is subject to phase shift caused by the speed of light and the distance to the measured source. Each counter must be

Re: [time-nuts] UTC and the speed of light?

2011-08-30 Thread Tom Van Baak
The counter of the frequency is subject to phase shift caused by the speed of light and the distance to the measured source. Each counter must be given an initial value of time in order to be called a clock. Hi Bill, When not in motion it's easy to synchronize remote clocks -- you just send