Re: Simultaneity by PeRi

On Mar 15, 12:49 am, Peri of Pera <rie...@xxxxxxxxxxx> wrote:
On Mar 13, 12:00 am, "Martin Hogbin" <goatREMOVETHIS...@xxxxxxxxxx>
wrote:





"Peri of Pera" <rie...@xxxxxxxxxxx> wrote in messagenews:59c77282-e0fe-4acc-b4aa-152a2fbdd6bc@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Simultaneity by PeRi

Simultaneity can be determined by
synchronising clocks, setting two clocks to the same time at location
A and then taking one of them to location B.

How quickly do you plan to move one clock to location B?

If an event occurs at A
at say local time 10.01 hrs and the signal is received at B at local
time 11.01 hrs and if the observer at B knows that the distance AB is
one light-hour and the speed of the signal is c, he could say the
event at A occurred simultaneous with an event that happened one hour
ago at location B.

Yes.  According to the convention you have incompletely described.

--
Martin Hogbin

Martin,
yes, my OP was incomplete. Regretfully, no one else noticed it. To add
more incompleteness let me add that there are two possible methods to
identify simultaneity (simultaneous events) and one impossible one:

1. Without a clock.
2. With one clock as described in my OP.

<<
3. With two synchronized clocks. This method compares the time of the
stationary clock with the time of the clock that has traveled at a
different speed and then returned to the common location. This method
is illusory because clocks cannot recognize dilated time let alone
accumulate it.


You are close.

We can connect a counter to the hetrodyne output of
a doppler police radar and the value on the counter
will be an accumulation of the dilated time.
So it is not impossible.

The key point is that the value is meaningless.
Some purely spatial or purely temporal information
is also required to derive time, distance or speed.

<< if you know about complex numbers you will notice
that the space part enters as if it were imaginary

R2 = (ct)2 + (ix)2 + (iy)2 + (iz)2 = (ct)2 + (ir)2

where i^2 = -1 as usual. This turns out to be the
essence of the fabric (or metric) of spacetime
geometry - that space enters in with the imaginary
factor i relative to time. >>
http://www.nrao.edu/~smyers/courses/astro12/speedoflight.html


Sue...


Peter Riedt- Hide quoted text -

- Show quoted text -

.

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