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Groups > sci.physics.relativity > #651745
| From | Thomas Heger <ttt_heg@web.de> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: ? ? ? |
| Date | 2024-02-23 08:09 +0100 |
| Message-ID | <l3qubtFoko5U1@mid.individual.net> (permalink) |
| References | <1HWE6H1jV8YTvxfaaL7fnCCcpe8@jntp> |
Am 20.02.2024 um 13:58 schrieb Richard Hachel:
> Eisntein said:
>
> ------------------
> We arrive at a much more practical determination along the following
> line of
> thought.
> If at the point A of space there is a clock, an observer at A can
> determine the
> time values of events in the immediate proximity of A by finding the
> positions
> of the hands which are simultaneous with these events. If there is at
> the point B
> of space another clock in all respects resembling the one at A, it is
> possible for
>
> an observer at B to determine the time values of events in the immediate
> neigh-
> bourhood of B. But it is not possible without further assumption to
> compare,
>
> in respect of time, an event at A with an event at B. We have so far
> defined
> only an “A time” and a “B time.” We have not defined a common “time” for
> A and B, for the latter cannot be defined at all unless we establish by
> definition
> that the “time” required by light to travel from A to B equals the
> “time” it
> requires to travel from B to A. Let a ray of light start at the “A time”
> tA from
> A towards B, let it at the “B time” tB be reflected at B in the
> direction of A,
> and arrive again at A at the “A time” t
> .
>
> In accordance with definition the two clocks synchronize if
>
> tB − tA = tA − tB.
> ---------------------
>
> I don't understand anything this man is saying.
>
> Is it me who's a moron or him who was incompetent and didn't understand
> anything at all?
>
Einstein assumed, that a place called 'A' and a very remote place called
'B' have own times ('A-Time' and 'B-Time') which do not necessarily
coincide.
To find a time 'AB-time' allowing to synchronize clocks at place 'A' and
place 'B', he took the local time of a place exactly in the middle
between A and B.
This time local to a location at (A+B)/2 would then allow to synchronize
clocks at equidistant locations like A and B.
The dependence of time on the location stems from an error of Einstein,
who made no efforts to compensate the delay of a light signal, caused by
the finite speed of light.
That's why a remote clock was seemingly too late and the later, the
further away.
But a hypothetical observer in the middle would see both ends of the
connecting line from A to B at the same time, hence could be used as a
judge, whether or not the clocks at A and B run in synch.
His time would then be 'common time' and could be used to synchronize
clocks at A and B.
I, personally, do not really agree, because removal of the run time
delay would have been an option, too, and much easier.
My method has a disadvantage, however, because synchronisation would
require a hypothetical signal with infinite velocity, which does not exist.
But one could measure the delay quite easily (by sending a 'ping' and
cut the delay for the roundtrip in half).
The delay time could be added to the coded timing signal and we have
also synchronisation. But in that case the time at the remote localtions
would be different to the time according to Einstein's method.
TH
TH
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