sci.physics.relativity

"Dr. Henri Wilson" wrote in message
news:bpkks3duboqo514ossen9lbdvb0n1agqse@...
> On Sat, 1 Mar 2008 10:04:51 +1100, "Artful" wrote:
>
>>"Dr. Henri Wilson" wrote in message
>>news:gsvgs354avoheoactmm4p4ec4q79c44bou@...
>>> If a clock that reads 12:00:00 EVERYWHERE,
>>
>>A clock isn't everywhere.. it is at particular location in space. What
>>you
>>said makes no sense.
>>
>>> even though other observers are not
>>> immediately aware of the fact, then it is universally 12:00:00
>>> everywhere.
>>
>>No .. it is 12 o'clock at that location (in space and time) of the clock.
>>Everyone will agree that at the location, the clock reads 12o'clock. The
>>clock at that location shows the proper time for the clock.
>>
>>> What is more, any number of clocks that were synched together and then
>>> fired
>>> off to all parts of the universe will all have the same reading at the
>>> same
>>> universal instant.
>>
>>If they had the same acceleration, then the observer at the point where
>>they
>>were fired off would agree that all the fired-off-clocks show the same
>>time.
> It doesn't matter how they get there.

Yes .. it does .. as different paths will result in different amounts of
proper time elapsing. The longest amount of elapsed time between two events
is for an inertial path between them.

>>He would not agree that they shows the same time that his clock shows, of
>>course, even taking travelling time of the light signal into account. And
>>if the clocks returned back to him, they would show a shorter elapsed time
>>than the clock that did not get fired.
> You have been brainwashed into believing such nonsense.

No .. I have simply both studied and understood the physics. Which was it
you didn't do?

>>> When a clock here reads 12:00:00, so will the clocks that were sent to
>>> Sirius
>>> and Algol.
>>They will all read 12:00 when it gets to 12:00 in their frame. Whether
>>or
>>not some other observer will see those clock having the same reading at
>>the
>>same time is a different question. Even taking travelling time of the
>>light
>>signal into account
>
> they will ALL read 12:00:00 at the same universal and absolute instant.

There is no such thing as a universal and absolute instant. It is frame
dependant.